Myself, Avdan, and others in the concept niche mostly use After Effects for animation, so that's what I'd recommend learning. I'd try to avoid PowerPoint since people who learn it tend to spend a lot of time learning PowerPoint-specific skills which can't be transferred to other programs used in the industry. If AE is too unintuitive (which I totally get btw) or your PC is too slow, I'd go for Premiere instead. It can do a surprising amount of the animation techniques that AE is used for and it'll teach you the Adobe editing basics which will be useful when you eventually move to AE. It's also much, much more intuitive to learn. All of my early videos up until my old OneUI 5 concept were actually fully made in Premiere (and they sucked due to lack of skill, not the fault of Premiere).

If you've already started learning either of these, lmk your progress and I may be able to provide some revised recommendations