I believe chess.com uses glicko scoring system, a bit different than over the board ELO rating.
You need to play rating games if you want to be rated. At first it will fluctuate a lot, until you play a handful of games. After some time you will gain less and lose less points after win/loss respectively.
Let me bore you some more
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Nov 5, 2020
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#2
I am a rank beginner.
What is the scoring system called?
How do I get a score to find out where I sit?