Add page about basics

content/en/usage/basics.md

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 ## Sign up
+
+You have to choose a server to sign up on, like you would choose an e-mail provider, or a World of Warcraft realm for your new character. The server will be hosting your account and your home feed.
+
+You can [browse a list of servers by categories and languages on joinmastodon.org](https://joinmastodon.org/#getting-started).
+
 ## Edit profile
 ### Picture, name and bio
+
+- You can upload a profile picture
+- You can upload a header image for your profile
+- You can set a display name different to your username
+- You can write about yourself in the bio
+- You can mention people and use hashtags and custom emoji in your bio
+
 ### Profile metadata
+
+Profile metadata is a way to add extra information to your profile that is easy to skim. You have 4 rows where you can define the label and the value. For example:
+
+|Label|Content|
+|-----|-------|
+|Age|25|
+|Country|Germany|
+|Pronouns|he/him|
+
+It's completely up to you what you put there. The content can contain mentions, hashtags, custom emojis and links.
+
 ### Link verification
+
+If you put a link in your profile metadata, Mastodon checks if the linked page links back to your Mastodon profile. If so, you get a verification checkmark next to that link, since you are confirmed as the owner.
+
+Behind the scenes, Mastodon checks for the `rel="me"` attribute on the link back. Likewise, Mastodon puts `rel="me"` on the links within profile metadata.
+
 ## Posting
+### Text
+
+- You can use up to 500 characters
+- You can mention other people like `@alice` or `@alice@example.com`
+- When mentioning other people, the domain part of their username is not counted
+- If you post links, they must begin with `http://` or `https://`
+- When posting links, all links are counted as 23 characters, no matter how long
+- You can use hashtags like `#example` so others can find your post by that tag
+- You can add a content warning to your post
+- The content warning is plain text. It does not support mentions, hashtags or links
+
+### Media
+
+- You can upload PNG and JPG images
+- Uploaded GIFs are converted to soundless MP4s like on Imgur/Gfycat (GIFV)
+- You can also directly upload soundless MP4s and WebMs (GIFV)
+- You can upload videos in the MP4, WebM or MOV format
+- Upload limit for images is 8 MB
+- Upload limit for videos is 40 MB
+- Images with a surface area larger than 1280² pixels are downsized
+- All media in a post can be hidden behind a spoiler
+
+### Custom emoji
+
+- Each server offers a set of custom emoji you can use, like on Discord
+- You can use an emoji using its shortcode like `:thounking:`