This thread applies to me as well.
A lot of people are saying. Work on tactics but what exactly does that mean? I don't know any tactics, so how could I practice them? What is a chess tactic and where do I learn them?
Working on tactics is not that hard. You have puzzle section here for instance. I use it from time to time, and I mostly use chess tempo tactics (I like it because there are standard tactics there - where gaining and losing of points does not corelate to time spent). Apart from that, there are chess books that revolves around tactics. This topic is 3 pages long, so I will not ask you to find my post. I'll just give you a link to a post I made with additional help:
https://www.chess.com/blog/nklristic/the-beginners-tale-first-steps-to-chess-improvement
A chess tactic is a sequence of moves that leads to a winning advantage for the side who did the tactic @rrpersson.
For instance this is a tactic called skewer:
The king has to move and the bishop picks up the queen.
You can learn tactics every weher, just search on youtube or look up the lessons/tactis on chess.com
Thank you!