The manual and help files are pretty good with it, though. And, I think you can ask the GIMP community such questions.
DH uses PhotoShop Elements, AutoDesk Sketchbook Pro, Clip Studio Manga 5 and a few other programs...when he has a problem or is on the left side of the learning curve, I’ve found I can input the name/edition of the program+question to search engines and get answers either from the users forum or the developer, often in tutorial form with screen shots. Few questions are unique or unanswerable.
Taken together, the pro versions of the above programs, even with updates and add-ons, are cheaper than PhotoShop and sometimes offer elements not available otherwise.
He’s in the learning phases of most of these programs. I think they are magical.