Through the mathematical signs after each move. These numbers, are evaluations made by the computer, using pawns. If for instance, you see +1.0 next to a move, then the White pieces are evaluated to have a pawn advantage. If you see -1.0, then the Black pieces have a pawn advantage.
If you see -2.84, then the Black pieces have almost a three pawn advantage, etc.
These are computer evaluations of the given position. The plus sign is white's advatage, the minus sign is black's advantage.
How do you use the information obtained from a computer analysis of a recent game. It tells me how often I messed up but does not tell me exactly when.