You learn
How to get better at Chess if you are 100 ELO.

I have only ever played the 10 minute timer Chess format.

Here are some ideas:
https://www.chess.com/blog/nklristic/the-beginners-tale-first-steps-to-chess-improvement
Good luck.

Learning the Scholar's Mate pattern and how to stop it is a good place to start. Here's a guide
That's good for 500 elo.
100 is more like simple exercises such as "is the knight attacking e4?" or "is the king in check?" stuff like that.

A simple way to improve is to just play at a time format you don't feel too rushed and then review your games (win and loss) with the engine to see where you made mistakes to understand what went wrong or right. As general advise, practice puzzles so you can start to recognize tactics like forks, pins, and so on so you can use them or defend against them.
New to chess players should first
1. learn all the rules. This includes castling rules, en passant, and other special pawn moves, along with Stalemate, insufficient material to checkmate, the rules of chess clocks. Surprisingly, some chess players don’t fully understand these rules leading to missed opportunities in their games or unfortunate mistakes. Don’t miss out!
2. Learn the basic checkmates of king and queen, king and rook, how to promote a pawn with the king assisting, and when it can be thwarted by a lone king and how.
3. Learn opening principles, and follow them!
4. Follow the CCT move method- each turn identify any captures, checks against the kings, and threats to any pieces. This will greatly assist in reducing missed checkmates, hanging pieces, and under defender pieces. Keeping your pieces safe and taking advantage of your opponents unsafe pieces will win you countless games early in your chess playing.
5. Learn the tactical motifs then practice using them by solving chess puzzles.
6. play slow games! Daily chess, 15|10 live games should be preferred and most often played so you can focus on finding good moves and following a good move method (CCT!) each position. Avoid speed chess and developing bad habits- they’ll be hard to break later on.
7. review your games, find trends in your mistakes, then weed them out of your future play.
Have fun! Chess takes time to learn, so prepare for many losses along the way. Focus on learning and improving each game, not the final results of each game.
-Jordan

Improving Your Chess - Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond
https://www.chess.com/blog/RussBell

You're resigning super early after you're down a piece, which would be fine if you're like pretty high rated but at your level there will be so many blunders, play the game till the end

How do I learn? Where do I start?
Start here, and go through all the lessons, starting from Lesson one ("New to Chess"):
(To get there, use the left navigation bar and click: Learn -> Lessons)
I believe free members are limited to one lesson per day. But that's fine, as you should not be doing multiple lessons in a day, anyway. (Your brain needs time to learn.)
I just started playing chess and my goal is to get to 1000 ELO so I can beat my friends. What can I do to get better at Chess? I have no idea where to start but I think that if I knew how to play Chess I would be pretty good.