Student or Learner
May I remind you of that saying: "Practice makes perfect."
The more you do something, the better you will become.
Can I replace that by the? Why that is used here?
Can I use about as an alternative to of?
Whilst of course Gillnetter is absolutely right about the realities of practice, it should be noted that the accepted standard idiom is "Practice makes perfect".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.