Here are some other resources, not arranged by me, that I find helpful.

• TCRF's debug documentation is essential for any hacking you may do—especially what they have on obj_debugger
• UTY speedrun community has some nice resources to explore
• For saves:
• UTY Save Editor is a good starting place, and comes with a tutorial for complete newbies
• This Google Drive folder is a great repository of saves across the game
• UTYW's Technical:Flags page has documented most flags in the SAVE file and what to note about them, so you can edit them yourself