Ratings adjust quickly when you are very new. Then as your rating moves to an area that statistics say is likely to be a fair approximation of your rating, the adjustments slow.
You can read all about the mathematical underpinnings of the system here - https://support.chess.com/article/210-how-do-ratings-work-on-chess-com
When you start playing, the site doesn't know what your actual playing strength is, so it makes bigger adjustments to it based on your opponents. If you start at 400 and lose to someone with a 300 rating, they are probably better than you. So it makes a big adjustment downwards because you have no history. So you lose a few more times before you win your first game, and your rating drops some more. The thing is, now they know you've lost to people so you need to prove your skills a bit more to go up more. Once you have played enough games your rating will move at a slower speed than it is now, too. Each match you play could be against someone with a lower or higher rating than you own. If you beat someone with a higher rating, it will go up more. If you lose to someone with a lower rating, it will go down more. But don't look at the rating like it is a score. It is intended to estimate your current skill level. If your rating were to suddenly increase a lot, you would face tougher opponents and lose more. After some time it will find an equilibrium. As you learn your rating will gradually go up, but it won't be steady. If you can beat a 400 rated person 100% of the time, it will go up very quickly until your rating is about 500 or so. Then you'll be playing against 600s and 700s occasionally. If you lose to someone 200 points higher than you, your rating might drop a couple of points. But if you win, it will go up a lot. And a lot means maybe 15 points or so. Swings of 50 points per game stop happening after your first few games.
Swings of 50 points will never happen once you have played a bunch of games. And while gaining rating right now will be relatively easy, it gets harder to improve your rating as you get stronger at chess.
Chess is a very difficult game to master. The top GMs you read about here studied the game full-time for years to reach their level. Don't expect to become a good player quickly. You are matched against other low-rated players, so you won't learn much or gain many rating points from beating them. Try playing long time controls so you can look more closely at the position and try to find better moves.
If you find chess interesting and entertaining, keep playing and studying as much as you feel like and have patience--more experience and knowledge will lead to better play. Ratings are not important, understanding what you're doing is the path to better play.
I'm a complete beginner, made an account and tried playing a couple games, ofc i lost misreably and went down to 200 (from 400). I watched the lessons and im winning games, but now that ive went up a bit im only getting 10 elo (or rating wtvr) per game
What's up with that, I lose a few games and my rating halves, i win 5 and i barely go up a 100??
Is there anyway i can get back to 400 without having to win 20 games straight (or making a new account) Seems a bit unfair