does it help to study endgames as beginner?

75% of the games are decided in middle game, 20% are decided by opening mistakes, maybe 5% are decided in the end game and the most of this games are obvious wins or lost games?

Just going half-way through Pandolfini's endgames will take you to 1400 online.

Why? I looked into it,  thanks, it is interesting, "basic endgames explained by America's leading chess teacher". Me... I just went trough some videos, of gothamchess, explaining opposition, philidor, lucena, that kind of stuff. But it looks to me  now that's enough? He recommended some books, "100 endgames you must know," but he said he have read the book when he was 1900.  Till now my  games never went to a challenging endgame. 95% of them are already lost of won, before it even started, why bother? I never have even basic endgame positions in my games yet?

Nice.

You are rated 1 300 rapid. It would be beneficial for you to know at least some basic stuff like: Opposition, some king and pawns endgames, 1 pawn up when it is a win, when it is a draw, and some rook and pawn endgames, epsecially Lucena and Philidor positions. Of course, I expect that you know how to checkmate with a single rook/single queen because I don't think you would get to 1 300 otherwise. Apart from that, you should aim for activity (including your king) whenever it is possible to do so.

Why do you need to know all of these? Because you can base some middlegame plans and try to maneuver the game in certain direction.

For instance, I had a game where I was a pawn down, the rooks were on the board and the position was hopeless if my opponent understood that the position will resemble Philidor position (a draw) if he allows me to exchange pawns. Not only that he allowed me, his entire strategy was to exchange pawns and simplify (which was a mistake in that position). I saw that if pawns get exchanged, I have a draw, there wasn't even a need to calculate. This proved that he didn't know anything about rook and pawn endgames, even at least in theory.

Not only that, but he offered me to exchange rooks and we just got to position where the kings are on the board and he has a single pawn, but I have an opposition and he doesn't have a waiting move. So it seems that my opponent didn't know much about opposition either.

So learning about endgames  - it will benefit more things than just endgames. Playing endgames is a good calculation exercise I believe, because sometimes it is easier to calculate a few lines because things are more straightforward with fewer pieces on the board.

You don't need to go overboard with studying endgames, just remember to have your pieces active, and learn basic stuff.

In any case, learning about basic endgame stuff is more important than learning about concrete opening lines. Of course, following opening principles is important, but I am sure you know the principles already, so I am not mentioning them.

Yes, it help you to calculate... it help you somehow look  differently to important squares. At the level i am, is more of...."White or black has two attackers on a certain square,  you have only one", lets go and put an other defender on it, problem solved...this kind of thinking?

That kind of thinking is useful on every level. But sometimes when you see you are losing a pawn and have the option to defend pasively or attack some other pawn or more , in many cases activity wins passivity. Of course it depends on the situation, sometimes you have to accept a passive position for a while.

And we all make mistakes where we defend even if there is a better move.

The key in the endgame is to take your time (especially if you are playing longer games, which should be played for improvement), and calculate as best as you can. What happens if I don't defend, do I have a better option?

But I am going a bit off topic, in any case, knowing basic endgame stuff can help you out. Sometimes directly, sometimes indirectly. It is certainly not a waste of time to get a little better in the endgame.

For instance, I was able to defend some opposite color bishop games a pawn down. Actually my strategy was to have this tyype of endgame when I lost the pawn along the way. Some will say: Yeah but it will not happen a lot.

Perhaps not, but it took me a few minutes to get to know basics of this endgame: put the pawns on the squares of your bishop, on the opposite squares of your opponent's bishop (which is the opposite of what you do normally, in the middlegame when you don't have a LSB for instance you put pawns on light suqares most of the time), so the other bishop can't attack it, and use your king where your bishop isn't located. Apart of that just calculate and play normally. And just because I spent a few minutes I drew some games and what is more important had a plan to try to play in a way so I can get this type of endgame.

Studying endgames can benefit your playing at any skill level.

The reason is that endgames are characterized by reduced material, for example bishop and pawn against knight and pawn. By studying such endgames you will get a much more intimate knowledge of what the strength and weaknesses of the pieces are than you will get by seeing them only in the middle game.

A second advantage is that when you have a grasp of endgame theory it can guide your choices of when to exchange pieces and what pieces to exchange in the middle game to reach a favorable endgame or to reach a draw if you're on the defense.

     Tarrasch and Capablanca, two of the best players ever, wrote manuals for beginners. Both started with endings, the simplest positions where the basic powers of the different pieces are most clearly demonstrated, and went on to more complicated positions. "If you can't play properly with a few pieces, how can you hope to play correctly with 32 pieces on a crowded board?" (Capablanca)

Gotham chess showed a game the other day that ended up King and Queen against a lone King. It ended up a draw with the 50 move rule because the guy with the Queen didn't know how to force checkmate. Don't be like that.

Yes, i saw this, i follow gotham, was a game between 400's, one did obviously dont know how to end the game wit KQ against K, these are really basic stuff, that's not what i am talking about...  Everyone know 800 plus or so. But nevertheless, it showed that endgames are important... But then i say.... i know how to end this endgame..... Then there are others... But they do not occur.