accuracy & analysis

I’m New to this app. Please help me understand the accuracy rating. Mine fluctuates wildly. I’ve won game with 64.4 and lost with 83.3.
I’ve had a 90. Game where I struggled And a 59.when I lost but played good,
I thought.
Analysis called one move a “Mistake” but followed it with a “Great move” though the “mistake” was to set up my next move.
I read in the forum about chess.com knows cheating by moves players make ?
How is that possible?
I doubt it because it can’t see why I make the move it calls a “mistake” ?
I’m a 800 rating player.
If I’ve Played hundreds of games vs the old Chess Challenger computer a lot growing up in the 70’s, can my moves be interpreted as “computer” like ? I have no idea.

The accuracy rating is how much you play like the computer.

If it was a mistake, then when your opponent ignores the way to take advantage, you made the great move.

The great move wasn't based on the mistake.