Ok...kinda embarrassed to ask this but

Can someone tell me a bit of how to read this?

How is the +,- decided

It indicates who is winning, for example here white is winning because the greater sodium of the bar is there's

How is the number decided?

thanks for the info

I do, sorry to make you type all of that

I was talking about the analysis 8.3 etc. ty though

The bigger the number is, the more clear it is that one player has the advantage.

± <1.00 = No advantage

± 1.50 = Barely noticeable advantage

± 2.50 = Noticeable advantage

± 3.50 = White/Black is clearly much better

± >5.00 = White/Black is completely winning

± Mx = White/Black has a forced checkmate in x moves

Each 0.01 in the evaluation is a "centipawn advantage," or one hundredth of a pawn, as Lichess puts it. So, if the advantage is ±2, that means one player has an advantage equivalent to being up two pawns. Lichess also measures "centipawn loss" for how much the advantage changes when a player makes a move that is not the best, according to the engine, and at the end of the game converts it into an "average centipawn loss." In general, an ACL of less than 50 is considered respectable, less than 35 is very good, and less than 20 indicates grandmaster-level play.

Thank you! That was very clear and easy for me to understand.

It's not embarrassing. It's a good question @Mochi-Muffin

Just like @Josh11live mentioned, it is the computer evaluation of the position. Computers can't "think" the same way humans do, so computers calculate super far and then give each position an objective evaluation of how much it thinks each side is winning by; their units of measure are "centipawns" (literally 100th of a pawn!). If the computer claims the position is 0.01, then that means it believes white is winning by one hundreth of a pawn. Positive numbers mean white is winning and negative numbers mean black is winning. If a position is 1.00, then it means white is winning by one pawn and if a position is -1.00, then it means black is winning by one pawn.

Keep in mind, this is the computer's evaluation, so it's more than just counting material. If material is equal and the computer says the position is -3.00 (for example), then that means black is winning by other positional factors (or at least not material yet) which equals about three points of material.

@Fr3nchToastCrunch gave a good estimate of "how good" an advantage is, but it is important to recognize that the higher level the player is, then the more they can convert with a smaller advantage. They said that "± 1.50" is a "Barely noticeable advantage" but I consider this a fairly decent advantage at my level and at the level of titled players, that's a clear advantage to that side. Conversely, chess beginners who just learned how the pieces move... they may need at least a 3 point advantage before they feel they are slightly winning.