Various thoughts at this point then.
You might get away with skipping it. It will be a deficit, especially if you get to programming, 3d formats and whatever else but at the same time you can happily learn some cheat making, text editing, fiddling with tile editors and more besides without it. I do occasionally question it being at the start as I rarely use it in hacking day to day but it is present at times and it is also a useful skill, and fairly good thing as an introduction to random data types as they have a clear use in general computing/maths concepts -- if a game uses a top bit in a large value for its own arcane reasons (not as common on the DS as it might be on the NES or something where every bit was valuable but I can still provide any number of examples) then if you had already met a similar thing before for allowing hex to have negative values, a far more obvious concept, you stand both a better chance of spotting it and a better chance of figuring out why.
If my explanation of that is not for you then it is not some deep hacking lore or anything that I might have been the only one to write about/write about in a non "I already know programming, just give me the facts" manner but in fact basic computing. Find a course that teaches programming, possibly some electronics as well, and such things will likely be included in that. I have some suggestions for English but don't read modern Italian anywhere near enough to vet such a course.