User guide for Obsidian

Hi, I am new to Obsidian and in this past few days I am testing all the note taking applications. It appears to be Obsidian is promising. However I could not find any user guide to learn the basics after installing the software.
Does this app has a user guide/ cheat sheet?

While having Obsidian open check the Help Guide by clicking on the “?” symbol on the bottom left.
If it’s your first time running Obsidian, once you open it choose the last option “Open help vault”.