Analysis

like -2 , -0.2

It shows who is in the winning position E.g. 1.0 white is in winning position and -1.0 black is. The bigger the number the better the position

1.0 is supposed to correlate with a pawn, and 3.0 with a piece.  Roughly speaking.  So +1 is white is winning by the equivalent of a pawn.  If material is equal, that either means that white can win at least a pawn in a forced line or that white has a pretty decent sized positional advantage.  

The posts above have answered your question, more or less. Here is the link to Chess.com's explanation: https://support.chess.com/article/656-what-do-the-computer-evaluation-numbers-mean-like-225

Don't you think that all the moves shown in Analysis as excellent moves are good moves only? Excellent moves are always fewer than good moves. I think now onward "excellent moves" should be "good moves" and vice-a-versa.

Don't you think that all the moves shown in Analysis as excellent moves are good moves only? Excellent moves are always fewer than good moves. I think now onward "excellent moves" should be "good moves" and vice-a-versa.