@Admin M@ has done a good job on the FM3 manual, and the auxiliary manuals for the blocks, foot controllers et al, are required reading in addition if you want to begin to get the whole picture.
Once you understand that something can be done on the hardware, you can do almost all of it in the editor; there are some things reserved for the hardware only, like resets and changing the built-in layouts, and there are some convenience things the editor provides but everything else I've looked for after reading the manuals has been available in the editor too. The
editor manual is out of date but knowing that there's probably a way to do something in the editor helps, and quickly you learn its ins and outs.
@yek has done a great job on the Wiki, and the information and lore, tweaks and reasonings from the team, are captured nicely. There's a LOT of information and I recommend reading and rereading through it many, many, times. Links are provided to the discussions that resulted in staff commenting on something so you can see the entire thread. The Tech Notes are also deep dives into things that make the modelers tick; They'll be over most people's heads initially but as they get more immersed in all-things Fractal the notes will begin making more sense as different topics are read...
...Fractal is a small company and a lot of the progress is due to a strong passion that they, and WE, have to make the FM3 and AF3 the absolute best products. Knowing
how to help is important.