[IceDane]

There is really not any way to give anyone a guide to doing what this guy does because it's not applying any special techniques to do anything. This isn't a binary reversing guide using a specific way to decode an encrypted executable, or whatever. This is quite literally just a guy who uses what he knows to figure out what is going on, and then learn more as is needed.

It will help not to put yourself into a box beforehand, like calling yourself a "purely frontend engineer." This is the kind of useless label for yourself that only serves to make you yourself think that you should stay in some arbitrary, badly specified corner of CS knowledge.

Literally just read about things, then use that knowledge to deconstruct other things. That's all that's going on.