https://en.wikipedia.org/wiki/Wikipedia:Unusual_articles

All kinds if interesting, whacky stuff.

Should be all the communities that your instance has discovered.

You need to type it with an exclamation mark in front. Lemmy will then provide you a dropdown of it’s communities, and upon selection convert it into a markdown link:

!fediverse becomes
[!fediverse@lemmy.world](https://lemmy.world/c/fediverse) 

which is shown as a link like this !fediverse@lemmy.world