diff --git a/docs/docs/api/routes/user-gamept.md b/docs/docs/api/routes/user-gamept.md
index af6761e09..ad7cfd356 100644
--- a/docs/docs/api/routes/user-gamept.md
+++ b/docs/docs/api/routes/user-gamept.md
@@ -225,7 +225,7 @@ GET /api/v1/users/zkldi/games/iidx/SP/pbs?search=Verfl
 `GET /api/v1/users/:userID/games/:game/:playtype/pbs/best`
 
 This returns the users' best 100 personal bests according
-to the [Default Rating Algorithm](todo) for this game.
+to the [Default Rating Algorithm](../../codebase/implementation-details/game-configuration) for this game.
 
 This is returned in descending sorted order.
 
diff --git a/docs/docs/codebase/documents/goal.md b/docs/docs/codebase/documents/goal.md
new file mode 100644
index 000000000..686c9298b
--- /dev/null
+++ b/docs/docs/codebase/documents/goal.md
@@ -0,0 +1,103 @@
+# Goal Document
+
+Goals are stored in `goals`.
+
+!!! warning
+	This document describes a goal, but does not describe
+	a user's "subscription" to that goal. For that, see
+	[User Goal Document](./user-goal.md).
+
+*****
+
+## Definition
+
+A base goal document is defined as follows.
+
+```ts
+interface BaseGoalDocument {
+	game: Game;
+	playtype: Playtypes[Game];
+	timeAdded: integer;
+	createdBy: integer;
+	title: string;
+	goalID: string;
+	criteria: GoalSingleCriteria | GoalCountCriteria;
+}
+```
+
+| Property | Description |
+| :: | :: |
+| `game` | The game this goal is for. |
+| `playtype` | The playtype this goal is for. Must be a valid playtype for the above game. |
+| `timeAdded` | The time this goal was added to the database. |
+| `createdBy` | The ID of the user that originally made this goal. |
+| `title` | A humanised name for this goal. |
+| `goalID` | A hash of the criteria and chart set for this goal. Used to de-dupe goals. |
+
+### Criteria
+
+Criteria is defined as follows:
+
+```ts
+interface GoalCriteria {
+	key: "scoreData.percent" | "scoreData.lampIndex" | "scoreData.gradeIndex" | "scoreData.score";
+	value: number;
+}
+
+interface GoalSingleCriteria extends GoalCriteria {
+	mode: "single";
+}
+
+interface GoalCountCriteria extends GoalCriteria {
+	mode: "abs" | "proportion";
+	countNum: number;
+}
+```
+
+| Property | Description |
+| :: | :: |
+| `key` | Defines the key this goal is for - these correspond to keys in a [Score Document](./score.md). |
+| `value` | The value this goal must hit in order for it to be achieved. What this value is interpreted as depends on `key`. |
+| `mode` | If single, this just means the user only has to have one score that meets the above criteria on the defined set of charts. If abs or proportion, the user must hit `countNum` amount of scores on the set of charts (or that percent). |
+| `countNum` | If mode is abs, this defines an absolute amount of scores the user must get. If proportion, the user must get this percent of the set of charts achieved. |
+
+### Charts
+
+The set of charts this goal applies to is added onto the
+goal document under the `charts` key.
+
+There are four types of goal.
+
+```ts
+interface GoalDocumentSingle extends BaseGoalDocument {
+	charts: {
+		type: "single";
+		data: string;
+	};
+}
+
+interface GoalDocumentMulti extends BaseGoalDocument {
+	charts: {
+		type: "multi";
+		data: string[];
+	};
+}
+
+interface GoalDocumentFolder extends BaseGoalDocument {
+	charts: {
+		type: "folder";
+		data: string;
+	};
+}
+
+interface GoalDocumentAny extends BaseGoalDocument {
+	charts: {
+		type: "any";
+	};
+}
+```
+
+For single and multi, the data field is a chartID, or an
+array of chartIDs respectively.
+
+For the folder type, the data field is a folderID.
\ No newline at end of file
diff --git a/docs/docs/codebase/documents/overview.md b/docs/docs/codebase/documents/overview.md
index b98de63d1..5f697a259 100644
--- a/docs/docs/codebase/documents/overview.md
+++ b/docs/docs/codebase/documents/overview.md
@@ -12,6 +12,11 @@ shape of those documents.
 	involve frequent links to this part of the
 	codebase documentation.
 
+!!! help
+	This section is a bit sparse, as I don't have the
+	time to populate it all. If you want to contribute
+	to this, please see [Contributing](../contributing.md).
+
 *****
 
 ## Definition
diff --git a/docs/docs/codebase/documents/score.md b/docs/docs/codebase/documents/score.md
index 5485286e4..de42a3e98 100644
--- a/docs/docs/codebase/documents/score.md
+++ b/docs/docs/codebase/documents/score.md
@@ -64,7 +64,7 @@ The base score document is structured as follows:
 | `isPrimary` | Whether this score is was achieved on a "primary" chart or not. You can read more on what a primary chart is [here](../implementation-details/songs-charts.md#isPrimary). |
 | `highlight` | Whether this individual score was highlighted or not by the user. This is one of the few mutable fields on the score document. |
 | `comment` | A comment left by the user on this score. If one is not present, it is left as `null`. Comments are capped at 240 characters. |
-| `scoreID` | A unique identifier for this score. Score IDs are prefixed with `R`. This identifier is derived from the content of the score, and thus can be used to dedupe scores. See [Score IDs](todo). |
+| `scoreID` | A unique identifier for this score. Score IDs are prefixed with `R`. This identifier is derived from the content of the score, and thus can be used to dedupe scores. See [Score IDs](../implementation-details/score-id.md). |
 | `importType` | The import type used to import this score. For more on this, see [Import Types](../import/import-types.md) |
 
 Now, absolutely none of the above fields contain
diff --git a/docs/docs/codebase/documents/user-goal.md b/docs/docs/codebase/documents/user-goal.md
new file mode 100644
index 000000000..c7d540cf9
--- /dev/null
+++ b/docs/docs/codebase/documents/user-goal.md
@@ -0,0 +1,41 @@
+# User Goal Document
+
+The user goal document represents a user's subscription
+to a goal.
+
+!!! warning
+	This does not describe the goal or its criteria,
+	for that - see [Goal Document](./goal.md).
+
+*****
+
+## Definition
+
+```ts
+interface UserGoalDocument {
+	goalID: string;
+	userID: integer;
+	game: Game;
+	playtype: Playtypes[Game];
+	achieved: boolean;
+	timeSet: integer;
+	timeAchieved: integer | null;
+	lastInteraction: integer | null;
+	progress: number | null;
+	progressHuman: string;
+	outOf: number;
+	outOfHuman: string;
+}
+```
+
+| Property | Description |
+| :: | :: |
+| `goalID` | This is the goal the user is subscribed to in this document. |
+| `userID` | This is the user this goal subscription belongs to. |
+| `game`, `playtype` | These fields are both *technically* redundant. However, for optimisation reasons, they are copied over from the goal document field. |
+| `achieved` | Whether this goal has been achieved or not. |
+| `timeSet` | The time the user set this goal. |
+| `timeAchieved` | The time this user achieved this goal. If the user has not achieved this goal, it is set as `null`. |
+| `progress` | The user's raw progress towards this goal. This is a number, and should not be displayed to the user. |
+| `outOf` | The value this goal is out of - this is a number, and should not be displayed to the user. |
+| `progressHuman`, `outOfHuman` | These are humanised, stringified versions of the above two fields. These convert things like the enum value of lamps to their string equivalents. |
diff --git a/docs/docs/codebase/implementation-details/game-configuration.md b/docs/docs/codebase/implementation-details/game-configuration.md
index 3c8c6b34c..586a2d3f2 100644
--- a/docs/docs/codebase/implementation-details/game-configuration.md
+++ b/docs/docs/codebase/implementation-details/game-configuration.md
@@ -10,8 +10,9 @@ combination, which contains things like the list of
 lamps for the game.
 
 !!! help
-	This page is currently unformatted, and is just a reference
-	to the codebase at points.
+	This page is currently unformatted,
+	and is pretty much just a copy-paste of the
+	local configuration files.
 
 	It would be really appreciated if someone formatted
 	the configurations for every game! For the time being,
diff --git a/docs/docs/codebase/implementation-details/goal-id.md b/docs/docs/codebase/implementation-details/goal-id.md
new file mode 100644
index 000000000..66aa35f31
--- /dev/null
+++ b/docs/docs/codebase/implementation-details/goal-id.md
@@ -0,0 +1,18 @@
+# Goal ID implementation.
+
+Goal IDs exist to dedupe goals when a user creates
+a new goal. For example, if a user wants to create a
+HARD CLEAR Mei goal, but one already exists, we should
+not insert two [Goal Documents](../documents/goal.md)
+representing the same thing.
+
+*****
+
+## Hashing
+
+To create the Goal ID, we perform a [json stable hash](https://github.com/zkldi/fast-stable-json-hash) on the
+`game`, `playtype`, `charts` and `criteria` of this field.
+
+This enforces that goals are unique on those fields.
+
+The above hash is then returned, prefixed with `G`.
diff --git a/docs/docs/codebase/implementation-details/score-id.md b/docs/docs/codebase/implementation-details/score-id.md
new file mode 100644
index 000000000..9c7a3a40f
--- /dev/null
+++ b/docs/docs/codebase/implementation-details/score-id.md
@@ -0,0 +1,44 @@
+# Score ID implementation.
+
+Score IDs exist to dedupe scores when a user re-submits
+the same scores. This happens frequently with `file/`
+and `api/` [Import Types](../import/import-types.md),
+as they typically resubmit the same scores.
+
+If a user only got a score once, we don't want to store
+it twice.
+
+*****
+
+## Hashing
+
+The score ID is created by hashing the following template string:
+
+```ts
+`${userID}|${chartID}|${dryScore.scoreData.lamp}|${dryScore.scoreData.grade}|${dryScore.scoreData.score}|${dryScore.scoreData.percent}`
+```
+
+with SHA256.
+
+This is then prefixed with `R`, and returned.
+
+## Why those fields?
+
+Games do a lot of wacky things. We'd rather not discard
+non-duplicates, so we're a little more strict than we
+maybe should be.
+
+UserID and chartID are so we don't accidentally collide
+with other user's scores or charts.
+
+Score and Lamp make sense - since if those change we no
+longer really have the same score.
+
+Grade and Percent are the slightly more strict ones. Some
+games have very strange external grade requirements, such
+as osu!standard enforcing a Full Combo for an S rank.
+
+Percent may not correlate with score. This was in anticipation
+to support BMS's `#RANDOM` instruction - where charts may
+have a dynamic amount of notes - but I've decided it
+wasn't worth it. Still, this is left in for futureproofing.
diff --git a/docs/docs/codebase/import/goals.md b/docs/docs/codebase/import/goals.md
index 20397f3bc..cbae3038c 100644
--- a/docs/docs/codebase/import/goals.md
+++ b/docs/docs/codebase/import/goals.md
@@ -29,8 +29,6 @@ as a result of the import. This is calculated as follows:
 For every goal matched, we iterate over it and evaluate
 it using `EvaluateGoalForUser`.
 
-The details of how this algorithm works (and goals in general work) can be found at [Goals](todo).
-
 We then need to convert the returns of that function into
 the expected goal format for ImportDocuments.
 
diff --git a/docs/docs/codebase/import/sessions.md b/docs/docs/codebase/import/sessions.md
index b8e83b448..f061e3320 100644
--- a/docs/docs/codebase/import/sessions.md
+++ b/docs/docs/codebase/import/sessions.md
@@ -2,7 +2,7 @@
 
 This page documents how Sessions are constructed.
 For a humanised explaination of sessions, see
-TODO.
+[this page](../../user/features.md#sessions).
 
 *****
 
diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
index 8d2a169ec..fd5ccbba8 100644
--- a/docs/mkdocs.yml
+++ b/docs/mkdocs.yml
@@ -95,11 +95,15 @@ nav:
       - "codebase/implementation-details/songs-charts.md"
       - "codebase/implementation-details/game-configuration.md"
       - "codebase/implementation-details/esd.md"
+      - "codebase/implementation-details/score-id.md"
+      - "codebase/implementation-details/goal-id.md"
 
     - Documents:
       - "codebase/documents/overview.md"
       - "codebase/documents/user.md"
       - "codebase/documents/score.md"
+      - "codebase/documents/goal.md"
+      - "codebase/documents/user-goal.md"
 
 markdown_extensions:
   - admonition