Chess mentor- try Silman's. That's very instructive.
When you have more space, more development, try to find your opponent's weakness. Is his king unsafe? Is his pawn loose? Target it.
If there's no weakness, try to avoid any good plan by him. That is, stop all counterplay. If successful, prepare your pieces, pawn storm on his king's side, and watch his king slaughtered. But remember - stop all counterplay.
So I'm pretty bad to okay-ish at chess. I not seldom notice that I play a better opening - in terms of development, positioning of pieces etc. - but don't seem to 'use' that advantage and waters down and equalizes or worse.
I was wondering, what is the best way to practice capitalizing on positional advantages, early on, but also in later phases? Solving tactics puzzles doesn't seem to remedy this problem.
Kind regards