This article
https://www.chess.com/article/view/chess-ratings---how-they-work
explains the concepts and includes a link to a post by Mark Glicko, the developer of the system used by Chess.com, where you can dive deep into the equations.
How is Elo change calculated?
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I’ve played a lot of games but I still don’t understand how the Elo change is calculated by, although I have seen some patterns.