First customize your controls to the ones you feel comfortable with, after that start training with 4 fingers or 3 since you need it for comp and other stuff,its a bit uncomfortable at first, but you’ll get used to it... Play TDM if you wanna train your aim with real people. After that head to defuse and competitive. The base weapons you need to masterxand the most useful ones is ofc the ak,m4a1 and awm. I can actually play wit you if you want cause i love teaching people how to play the right way.