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+# Development Guide
+
+Welcome to the Tildes Issue Log development guide, this will be very concise.
+
+## Setup
+
+1. Clone the repository.
+1. Create a `config.json` file from the sample `config.sample.json` file. The `gitlabToken` should be [a Personal Access Token](https://gitlab.com/profile/personal_access_tokens) with the `api` scope available.
+
+## Project Overview
+
+The Tildes Issue Log is set up with 7 scripts, 6 of which can be run on their own.
+
+If you want to run any of these on their own, use `yarn ts-node 'source/scripts/<script>.ts'`.
+
+These 7 are the following:
+
+### `assets.ts`
+
+Extracts the fonts and favicons `.tar` files located in `source/pages/assets/` and outputs them in `public/`.
+
+### `download.ts`
+
+Downloads all the commit, issue and merge request data with the GitLab API and saves it to `temp/data/`. If any of these already exist for today (meaning you have downloaded them previously) it won't try to redownload them and will use the existing ones instead.
+
+### `feeds.ts`
+
+*This is the script that can't be run on its own.*
+
+Generates the Atom, JSON and RSS feeds from the post list that is created by `html.ts`. The feeds are output to `public/feed.{atom,json,rss}`.
+
+### `html.ts`
+
+Takes in all the generated data by `download.ts`, `official-topics.ts` and `statistics.ts`, and the Markdown posts in `source/pages/posts/` and generates all the HTML for the site.
+
+The HTML is generated using Nunjucks templates, all of which can be found in `source/pages/templates/`.
+
+The HTML generation also linkifies Tildes-style `@user` mentions and ~group mentions.
+
+This script also writes a Markdown file to `temp/email.md` to be used for [the mailing list](https://lists.sr.ht/~bauke/tildes-issue-log). If you plan on sending the email, don't forget to change the header so instead of it being something like this:
+
+```
+<h2 id="may-2020">
+May 2020
+<span id="authors">by @Bauke</span>
+</h2>
+```
+
+It looks something like this:
+
+```
+# Tildes Issue Log
+
+## May 2020 by @Bauke
+```
+
+### `official-topics.ts`
+
+Scrapes [~tildes.official](https://tildes.net/~tildes.official) and extracts all the official topics that were posted after the latest one we have saved in `source/pages/data/official-topics.json`.
+
+### `redirects.ts`
+
+Creates HTML files for the posts [before the 2.0.0 redesign](https://gitlab.com/Bauke/tildes-issue-log/-/commit/959c68125e8ac810d79f9a8cc8d2d7072300b320) that contain a `<meta http-equiv="refresh">` tag that redirects to the new wanted location after 5 seconds.
+
+The old URL scheme was `https://til.bauke.xyz/posts/<month>-<year>.html`.
+
+The current URL scheme is `https://til.bauke.xyz/<year>/<month>.html`.
+
+An example: https://til.bauke.xyz/posts/january-2020.html
+
+### `statistics.ts`
+
+Generates various statistics from the downloaded data `download.ts` creates.
+
+## Writing Posts
+
+To start writing a new post, create the Markdown file as `source/pages/posts/<year>/<month>.md`. Every post should contain the same header similar to this one:
+
+```
+<h2 id="may-2020">
+  May 2020
+  <span id="authors">by @Bauke</span>
+</h2>
+```
+
+The `@user` mentions are automatically linkified, so it's simple to add multiple authors.
+
+After that it's all up to you. As mentioned in the `html.ts` section, `@user` mentions and ~group mentions are automatically linkified.
+
+If you write and intend to publish a completely new post, don't forget to update the latest post link in the ReadMe.
+
+## Building
+
+To test and build the entire site, you can run this command:
+
+```
+yarn test && yarn download && yarn statistics && yarn official-topics && yarn build
+```
+
+This will run all the scripts in the desired sequence. It's not necessary to run it like this, once you have successfully ran `yarn download && yarn statistics && yarn official-topics` once you can run `yarn build` by itself after, but this way everything is generated and ready for the post.
+
+`yarn build` runs all the `build:...` commands inside `package.json`. Some of these commands are do not run scripts, so if you want to build the entire site use `yarn build` to include everything.
+
+## Testing/Linting
+
+The JavaScript and TypeScript is linted by XO. If XO ever complains, you can usually fix it quickly with `xo --fix`. If not it will usually tell you what exactly to fix.
+
+The SCSS is linted by Stylelint with an XO-like config.
+
+If you only want to lint JS/TS, use `yarn xo`.
+
+If you only want to lint SCSS, use `yarn stylelint 'source/pages/scss/**'`. Stylelint might try to lint the compiled CSS in `public/` without the specified path and blow up with errors, so don't forget to include it.
+
+You can run both of these linters at the same time with `yarn test`.
+
+## Committing
+
+If you have written a new post, there's a few things you should do before you commit.
+
+* Proofread the new post.
+* Build the site, copy the entire contents of the post from the site. (`CTRL+A` and then `CTRL+C`). Then paste this into LibreOffice Writer or equivalent program and do a spellcheck. Ignore any false positives it might mark like `@user` mentions or unknown but correct words.
+* Make sure there are new statistics for this month in `source/pages/data/statistics.json`. Even if they are all 0, they should be included.
+* If any official topics were posted, make they are added correctly in `source/pages/data/official-topics.json`.
+
+## Deploying
+
+Deployment is completely and automatically handled via the GitLab CI/CD and hosted with GitLab Pages.
+
+The CI/CD will first run `yarn test` to make sure everything is good. And then it will run `yarn build`. If successful it will save the generated `public/` directory as artifacts and upload it to be used on the live site. If either of these steps failed nothing will be uploaded.
diff --git a/ReadMe.md b/ReadMe.md
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--- a/ReadMe.md
+++ b/ReadMe.md
@@ -4,6 +4,10 @@
 
 [Click here to view all posts](https://til.bauke.xyz/posts.html).
 
+## Development
+
+If you're interested in developing the site or writing a new post, see [the Development document](Development.md).
+
 ## License
 
 Licensed under [AGPL-3.0-or-later](License).