You don't have to read everything all at once, but here is what I would tell someone like you who wants to be a lot faster
2x2:
Well, for 2x2, I actually use 2 methods simultaneously, because it all depends on the scramble. There's what I call COP (CFOP without F2L), and Ortega. With these methods, I average 6.5 on 2x2, and with enough practice, I am slowly chipping away at that time. Just find where you like it and grind for about a month and you should see your times decrease dramatically (at least that's what happened with me)
3x3:
I know CFOP and I am currently working on learning Full PLL. What I would recommend for you is just learning 4LLL, I like SCR's tutorial, but that will totally help with your last layer and can decrease your times by at least 5 seconds once you are good at that. Then try learning basic F2L, that's what got me averaging 25 or better. Now with what I know, I average 20 seconds flat, and I am chipping away at that time as well, however, I practice 4x4 more.
4x4:
When I started getting into 4x4, I struggled trying to transition from reduction to Yau, because it was hard forgetting most of my muscle memory and getting used to the new method, so I stuck with reduction and made it to average 1:45, but that just won't cut it in comp. Once I learned Yau, my average dropped by about 15 seconds (after practice). You will definitely want to learn 3-2-3 edge pairing, it will save you a ton of time in your solves. With Yau, my PB went from 1:24 to 1:06.
Try what fits your needs first, then try the other stuff. I hope this helps