Yes, there are even documentations about documentation which is itself a bit of a paradox when you think about it. But there are many documentation sources out today for just that purpose. 

In fact Obsidian itself is a fantastic documentation source. It serves to explain and give tutorials for me. Just stick with one though. 

Documentation Sources: 
- Wikipedia 
	- the original documentation site 
	- this generally documents **concepts** though and serves as an encyclopedia for documentation on certain topics. 
- Notion 
	- Notion has a wiki template too 
	- Notion documents more adaptively and is user-friendly for many kinds of adaptation from **code**  to task-assigning. 
- Obsidian 
	- Especially with Obsidian Publish it can turn into a great wiki
- Google Docs 
	- you can now publish anything made in gDocs to the web!
- MkDocs