Getting Started – this is a good place to start!
FAQ - Frequently Asked Questions – see if your question has already been answered
Troubleshooting – detailed guides for common issues
Settings – information regarding the various settings of PPSSPP
Multiplayer – help for ad hoc and infrastructure multiplayer
Reference – specific documentation about various features of the emulator
Development – information about PPSSPP and PSP development
PSP Hardware – technical notes about the PSP device internals
If you can't find what you're looking for above, use the menu to the left (or the "three lines" or "hamburger" menu in the top right if you're on mobile) to browse the documentation.