Can you give an example from one of your games?
Understanding endgames.

Here is the total game i played
1.e45.5c513.3
2.Lc412.5Sf65.8
3.d322.6Sc629.8
4.Sf333.2e550.3
5.Le316.9d639.9
6.O-O10.8h623.6
7.h330.4Le635.1
8.Sc31:22.6Sb43:00.5
9.Lb5+50.5Ld747.7
10.g438.6Lxb51:38.8
11.Sxb51:07.4a639.0
12.Sc335.9d535.1
13.a343.3d41:35.0
14.axb438.5cxb456.3
15.Lxd41:40.0exd41:10.5
16.Se250.6Ld649.1
17.Sexd446.4O-O1:42.9
18.e51:55.0Lxe52:21.0
19.c322.5bxc32:05.0
20.bxc37.8Dd51:02.9
21.Te136.7Lf41:11.5
22.Tb12:09.7Tab856.5
23.Te730.6Ld62:01.2
24.c456.8Dc52:06.1
25.Texb751.4Dc82:26.1
26.T7b649.1Dd81:03.9
27.Txa629.8Ta81:26.4
28.Tba11:36.2Dc72:56.5
29.Txa81:18.7Txa827.8
30.Txa8+15.6Kh79.0
31.Da136.3Sd754.3
32.Da62:03.9Sc51:19.3
33.Dc857.0Dxc840.9
34.Txc813.8Sd751.0
35.g549.3Kg61:50.0
36.Tc646.9Kh73:26.3
37.Txd615.1Sf81:37.1
38.Se556.3Sg652.4
39.Sxf740.6Kg81:02.6
40.Sxh6+33.1gxh611.6
41.gxh610.1Kh77.4
42.Sf513.4Sf831.0
43.c513.0Kg818.7
44.c67.7Kf723.9
45.c749.3Sg632.2
46.c8=D10.2Se530.7
47.h715.8Sg618.0
48.h8=D38.6Se733.8
49.Dhf8#33.91-0

This is why I wanted you to post a game.
The endgame starts after 34.Txc8 (also called 34.Rxc8)
And at the start of the endgame black has a losing position, so studying endgames won't help here.
Textbook endgames are where each side has equal (or nearly equal) material. Like Rook and pawn vs rook. That's an endgame you learn about in a book. Sometimes new players are confused and think "endgame" means the end of the game, no matter the position. But this is not true because some games end in the opening. Some games end in the middlegame.

Thank you Stiggling. This actually helped me a lot. Now i know where to look for my blunder in this game
Actually i lost the game in the middle game ?

Actually i lost the game in the middle game ?
Yeah, so around 23 you have a good position.
Then white wins your two queenside pawns. After that (with good play) black should lose. So probably advice to improve would tell you to work on tactics, not endgames.

DeirdreSkye: Thank you, i will get the book you recommand.
I have played chess only as a minor hobby for some time, but i am willing to put in effort to gain both knowledge and rating point in the future

There are two types of endgames.
Practical and theoretical endgames.
Theoretical endings are those have been discovered the way ( technique) how to win them or make a draw. You have to learn and practice the technique so when the position it appears in your games, to know-remember that this is a position you have studied and then you will have a path, a map in your head how to play these.
Practical endgames are those types have not been discovered the way how to play for a forced win or make a draw. In these situations, you have to play based on the general principles of the piece activity and positional understanding. Your goal is to convert the practical endgame into a theoretical ending where it favors your side.
A good book that will explain to you all the important theoretical endgames that appear more frequent to your games with a procedure according to your skill and chess development is IM Silman's endgame course.
https://www.amazon.com/Silmans-Complete-Endgame-Course-Beginner/dp/1890085103
Read the book and study the technique until you know these positions before they even appear on the board.

Bishop_g5. Thank you for your answer and i do understand the importance of the study And when i have the pleasure of actually gaining knowledge from you guys who have a lot more experiance then my self. it really feels as i found a good place to learn.
Btw. I will registrate to a local chess club here where i live. I think it will help me a lot

I agree with DiedreSkye that endgame study is useful even if you aren't getting them often in your games.
Can anyone recommend a book that has endgame studies in it that are similar to those in Yusupov organized by theme. For example I am currently doing the chapter of Yusupov book 1 dealing with "The Wrong Bishop". Those studies are excellent and about the correct level for me.
I have other endgame books (Silman, DEM, and the various chapters in Yusupov) and I find them excellent, but I think a book of studies organized by topic would be a good supplement.

I think I want the second or a combination of the two. This would be an example (and about on the right level for me).
White to move:

Thank you. While I really don't need the explanation part of the book (no harm though , it does look like it has many many positions that would be great to work out. (I was able to look at some sample pages).
I have come to the conclution i suck in endgames, and would like to find books or pdf files that can explain a good way to understand the endgames, because when i study the games i loose i can see some of my blunders but i can not understand where the first wrong moves comes. Openings and middle games i feel is ok, but i really need some guidance in endgames
Thank you.