user16973: I know the basics and some basic tactics in chess, but I want to learn new and advanced tactics. Can anybody tell me any source for that?  

user16702: chesstempo.com is an excellent site for learning and practicing chess tactics. You can use it for free and the puzzles will adjust based on your success rate from easy to puzzles grandmasters get wrong.
Be sure to read the comments when you get a puzzle wrong as it often reveals some tactic type that you may have never seen before.
They also have a glossary of tactic types.

user14202: There are a lot of sites with random puzzles, but if you want to be systematic I recommend "Encyclopedia of Chess Middlegames: Combinations"
This is a large book of puzzles organized into 16 categories.  These types of puzzles also appear in any Chess Informant -- which also has endgame puzzles.

user-1: I have tried some of the existing sites that provide exercises. 
If you are searching for common tactical position, chesstempo is sure one of the best options with ilimitated free exercises.
If you are searching for incredible checkmates, sacs etc, chess.com has a nice trainer, the problem is it is not free.
You have also lichess. The exercises at this site are taken from blitz games of the players. They use stockfish to generate them. Some of them are doubtful, but a punctuation system is doing his task. 
If you want to become a good player in long games (90+30) I recommend you to do lots of exercises at chesstempo, but lichess exercises are nice for tricks and so and totaly free.

16973: <p>I know the basics and some basic tactics in chess, but I want to learn new and advanced tactics. Can anybody tell me any source for that?  </p>
 16702: <p><a href="http://chesstempo.com" rel="nofollow noreferrer">chesstempo.com</a> is an excellent site for learning and practicing chess tactics. You can use it for free and the puzzles will adjust based on your success rate from easy to puzzles grandmasters get wrong.</p>

<p>Be sure to read the comments when you get a puzzle wrong as it often reveals some tactic type that you may have never seen before.</p>

<p>They also have a glossary of tactic types.</p>
 14202: <p>There are a lot of sites with random puzzles, but if you want to be systematic I recommend "Encyclopedia of Chess Middlegames: Combinations"
This is a large book of puzzles organized into 16 categories.  These types of puzzles also appear in any Chess Informant -- which also has endgame puzzles.</p>
 -1: <p>I have tried some of the existing sites that provide exercises. </p>

<p>If you are searching for common tactical position, <a href="https://chesstempo.com/" rel="nofollow noreferrer">chesstempo</a> is sure one of the best options with ilimitated free exercises.</p>

<p>If you are searching for incredible checkmates, sacs etc, <a href="https://www.chess.com/" rel="nofollow noreferrer">chess.com</a> has a nice trainer, the problem is it is not free.</p>

<p>You have also <a href="https://lichess.org/" rel="nofollow noreferrer">lichess</a>. The exercises at this site are taken from blitz games of the players. They use stockfish to generate them. Some of them are doubtful, but a punctuation system is doing his task. </p>

<p>If you want to become a good player in long games (90+30) I recommend you to do lots of exercises at chesstempo, but lichess exercises are nice for tricks and so and totaly free.</p>
