i need help with learning yuzuriha

Hey , i'm new and i'm having a really hard time learning this game. mizuumi guides are pretty overwhelming for a beginner. Are there any other guides that are considered pretty good by the community apart from the ones listed on yuzu page on mizuumi? and also can someone explain to me why when im trying to learn air stance pressure after inputting j.236A~[C] i can't input another j.236A. Also why do i have enter stance in the air only to cancel the stance and input j.236A again? it seems redundant at first glance