@Jack15 Its' really simple.........just start playing bad chess normally and you will naturally become good at Antichess....(just joking)
Real tips,
Learn some tricks in the opening, to lose material quickly.
Learn antichess endgames( really important) from the wonderful studies here on Lichess
Always observe carefully when you have more than 1 capture to make, check which capture(s) will make you lose peices quickly .
You have to constantly practice and you will gradually become better ....😊😊