I am new to chess and sometimes when I play against Jimmy or Martin (computers for beginners) I would always have made a blunder so how do I avoid one
https://www.chess.com/terms/chess-blunder
this may help
A blunder is a move that turns a won position into a lost position.To avoid blunders always check carefully that your intended move is no blunder before you play it, no matter how obvious the move appears.
I am new to chess and sometimes when I play against Jimmy or Martin (computers for beginners) I would always have made a blunder so how do I avoid one