Hi! Generally want mo unahin 'yung raw mechanics mo like crosshair placements (ito pinakabigdeal for me), tapos comfortability mo sa mouse sensitivity with flicking kailangan hindi ka strained kapag naglalaro. Usually okay na 'yung maglaan ka ng oras sa shooting range but if you want you could also use third party software like aimlabs parang additional training mo na rin.
Lastly, 'yung game sense, isa 'yan sa pinakamahalagang aspect ng game. Isipin mo nalang na parang 3D chess board ang fps, kailangan may idea ka saan nakaposition mga kalaban, saan sila manggagaling anong angle iyong babantayan mo. It all boils down in the end sa combination ng dalawa.