How do you checkmate?

If possible, you should also try promoting a few pawns.


Um, I've checked your blitz rating and suggest, with all due respect, you should consider yourself a beginner. Some comment advise studying endgame, which I fear is not yet something a player your calibre should be concerning themselves about. I advise taking on chess tactics on a daily basis and work on your opening and middlegame before adventurously going for the endgame.
Umm... look I dont want to be harsh, but with an elo of less than 200 you aren't "really good" at anything. You need to start learning the basics first and watch a few chess videos on youtube, do basic tactics and take things from there.

No one who has answered your question is any good either.
I recommend Renault and Kahn, The Art of the Checkmate. Also get an old collection of miniatures, such as Irving Chernev, The 1000 Best Short Games of Chess.
BTW if there is any one here who wants take me on in a chess game and give me tips and stuff it would be much appreciated

I am definitely not the best player to help you and I do struggle with your same problem, but looking at a lot of your games, you often hang pieces out where the opponent can take the piece with no repercussions. You also should try and not only think about what you would like to move. Focus on what the other player is going to do as well. Again, in no way am I saying I am good, or that I have the best advice, but hopefully this helps.
https://www.chess.com/lessons/course/finding-checkmate
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
http://www.gambitbooks.com/pdfs/Chess_Endgames_for_Kids.pdf
Silman's Complete Endgame Course
https://web.archive.org/web/20140708103149/http://www.chesscafe.com/text/review594.pdf
http://theweekinchess.com/john-watson-reviews/theres-an-end-to-it-all
https://www.silmanjamespress.com/shop/chess/silmans-complete-endgame-course/

I recommend Renault and Kahn, The Art of the Checkmate. Also get an old collection of miniatures, such as Irving Chernev, The 1000 Best Short Games of Chess.
Thank God a master is here to show a proper answer comes from Amazon.com recommendations.
I guess you got your sensitive feeling hurt because you had posted in this thread. Don't take it personally. You are not the focus. You are simply part of the crowd of those who should be learning instead of preaching.
For the record, I'm not a master. Sure, I've beaten masters. My overall score in 2018 in blitz against titled players was -2 over 30-35 games.
Also, your assumption that my recommendations are Amazon recommendations is ludicrous. I mentioned two out of print books that helped me personally.
I wrote a book on checkmate patterns for my students. I did not recommend it. It is available only via PDF, although several hundred copies have been sold through chessuniversity.com. If the OP is interested, send me a private message.
The Art of the Checkmate inspired my own database searching that led to problem sets for my students. My booklet is designed to inspire similar personal study.
If you want to learn to checkmate, study games that ended that way.

https://www.chess.com/lessons/course/finding-checkmate
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
http://www.gambitbooks.com/pdfs/Chess_Endgames_for_Kids.pdf
Silman's Complete Endgame Course
https://web.archive.org/web/20140708103149/http://www.chesscafe.com/text/review594.pdf
http://theweekinchess.com/john-watson-reviews/theres-an-end-to-it-all
https://www.silmanjamespress.com/shop/chess/silmans-complete-endgame-course/
I'm certain you have some links to reviews of Pandolfini's Endgame Course. Much of this book concerns fundamental checkmates.
… I'm certain you have some links to reviews of Pandolfini's Endgame Course. ...
Actually, I don't, but I have seen it and browsed through it a bit. I would guess that it is a reasonable choice.

For beginners there is a checkmate trick that u can do
When your opponents king is in a crowded area with his pieces, you can get your queen right in front of him and when he captures your queen there should me a peace defending the queen
And if no pieces can capture the queen, or he cant move THAT IS CHECKMATE!

Without any further details about what the problems are that you are facing, I don't think it's really possible to help you, other than advice that you study endgame theory, starting from the very beginning (KQ vs K, KR vs K, and so on).
One thing that occurred to me right now is that could it be, perhaps, that you are having trouble finding a way to win when there are only very few pieces on the board because you are not bringing your king into the game to help? Your king becomes crucial in endgames where there are just some pawns and perhaps a couple of minor pieces left (or even the queens in some cases).
If that's not it, then you'll have to go into more details. We can't read your mind.