How do you stop losing pieces in chess?
Before every move, look at what your opponent's last move attacks. If a piece of yours is attacked and nothing guards it, move it to a safe square, guard it, or take the attacker.
Then check your own move: does it leave anything unguarded? Most beginner games are lost to a piece left hanging, not to a deep plan.
A piece attacked by something worth less (a pawn attacking your knight) is in danger even if it is guarded.
Try it
Black is attacking. Make a move so nothing of yours can be taken for free (look for every attacked piece).
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Every position here is a lesson from the course, checked by its rules engine. Part of Chess Path, a free chess course. Free coach for your Chess.com and Lichess games.