The only way of getting better at tactics is doing some, i suggest practicing tactical positions at chesstempo.com, they have about 80000+ tactic problems for you to complete, plus a stat board of how much you have improved, for free!
How can I improve my tactics?
There are many possibilities such as Winning Chess by Irving Chernev and Fred Reinfeld.
https://web.archive.org/web/20140708093415/http://www.chesscafe.com/text/review919.pdf

practicing in chess.com tactics trainer will help, but it will cost you as you need premium membership for unlimited problems

If you are a beginning player avoid tactics trainer here to start, as it will only cause you to rush your moves and your thinking, when you need to be understanding not rushing. Instead try Chess Tempo, as mentioned, and particularly use the standard or mixed mode. You could also get some simple tactics books and work through them. You will only improve in tactics, like in any aspect with chess, with time and dedication. There's no quick fix.

I heard that carefully analyzing your lost games will help too.
Not only will it 'help' it is kind of completely key in improving your chess. Absolutely the first point of call. Why wouldn't it be?

I heard that carefully analyzing your lost games will help too.
Not only will it 'help' it is kind of completely key in improving your chess. Absolutely the first point of call. Why wouldn't it be?
That's what I hear. I am finally starting to listen and just analyzed my first game. It's hard at first.
Tactics is simply calculation. As you play more and more games, you might recognize positions where you can apply a neat tactic you picked up in the tactics trainer or perhaps one an opponent had used on you in the past

Actually tactics is less than calculation. Tactics are the immediate board and things that come out of that. Tactics are basically "playing chess". So when someone says improve tactics what they probably mean is "help me see what's right in front of me better". That takes patience and discipline, its hard to play chess if you're moving too fast. Might I recommend playing classical and thinking for 10 minutes every move?

If you are a beginning player avoid tactics trainer here to start, as it will only cause you to rush your moves and your thinking, when you need to be understanding not rushing. Instead try Chess Tempo, as mentioned, and particularly use the standard or mixed mode. You could also get some simple tactics books and work through them. You will only improve in tactics, like in any aspect with chess, with time and dedication. There's no quick fix.

If you are a beginning player avoid tactics trainer here to start, as it will only cause you to rush your moves and your thinking, when you need to be understanding not rushing. Instead try Chess Tempo, as mentioned, and particularly use the standard or mixed mode. You could also get some simple tactics books and work through them. You will only improve in tactics, like in any aspect with chess, with time and dedication. There's no quick fix.
Another problem of TT in here is that tactics are not that many, so if you start doing a bunch (and you tend to do them a lot if you're under time pressure) then you'll start seeing the same tactics and you can solve them instantly by memory.
TT on here does have very interesting problems though.

If you are a beginning player avoid tactics trainer here to start, as it will only cause you to rush your moves and your thinking, when you need to be understanding not rushing. Instead try Chess Tempo, as mentioned, and particularly use the standard or mixed mode. You could also get some simple tactics books and work through them. You will only improve in tactics, like in any aspect with chess, with time and dedication. There's no quick fix.
soo can you recommend me some books?
I don't have that many tactics books. Chess Tactics for Students by Bain is always championed as is Seirawan's tactics books. I don't have them myself but would recommend them on their excellent reputation. The Manual of Chess Combinations - Chess School books are excellent too. I have book 3, this is really hard and not so good for general tactics (more visualisation) but the lower books will be. Other than that, just dig around the threads and when you see strong players recommend a book over and over again, you know it'll be good.
I don't have that many tactics books. Chess Tactics for Students by Bain is always championed as is Seirawan's tactics books. I don't have them myself but would recommend them on their excellent reputation. ...
Chess Tactics by Yasser Seirawan with Jeremy Silman
https://web.archive.org/web/20140708090229/http://www.chesscafe.com/text/review492.pdf
Any help would be appreciated.