Accuracy

In Youtube Ive Seen Most Grandmasters Average 80-100% accuracy , When i was analyzing my games , most of them are at the 80-93% , I dont think its right , because i am a 840 Rating Player , How Is Accuracy Measured ?

This support article has all the details~

https://support.chess.com/article/1135-what-is-accuracy-in-analysis-how-is-it-measured

When your opponents are bad, it is relatively easy to play good moves (because they often make obvious blunders and they put no pressure on you).

Accuracy is a meaningless thing with no real chess significance. It is just an gimmick that chess.com invented.

If the opponent is not putting pressure on you, you will probably have many good moves in a position, so if you choose one, your play will be accurate.

But if the opponent plays a move that you have only 1 good move as a response and does it for 15 moves in a row, it is much more likely you will go wrong.

So the stronger the opposition is, the more difficult is to achieve a high accuracy game.