i seen skilled players and their videos practically use their keyboard > mouse 90% of the time, is that how i should being playing?
Yep you play mostly on your keyboard. You want offload from mouse as much as possible, even you still need fast mouse speed, you can’t do everything on keyboard. I suggest you to check starcraft 2 core layout of liquidforums. Use camera hotkeys, jump to last alert, add to unit group and remove units from current unit group. Unit group forward button on mouse side buttons etc.