I've linked the article explaining the rating system below. A short explanation would be that when you first join your rating bounces up and down like a gymnast on a trampoline. After a hundred or so games, it's more like a fat man taking a nap in a hammock.
https://support.chess.com/article/210-how-do-ratings-work-on-chess-com
Hello, I have just recently joined chess.com and have been playing chess for about a month using smartphone app games and mostly learning from YouTube and library books. I played my first game against a real person today on chess.com and they were winning but then I made a slight comeback (still down on material) and they resigned. So I am puzzled that my rating has jumped to 916 after one game which I don't feel I really won anyway and I don't feel that I am anywhere near 916 or ready to face that level of play. Will this just correct itself as the next few players wipe the floor with me? Something to look forward to then?! Thanks in advance.