[Please don't advertise any other websites here -MOD] is in my opinion , one of the greatest. As chess.com you can get the pgn of your games but you can also get a free stockfish analyse of your game on site for free :) :) :) Tactics Puzzles are free and no limit. You can do a puzzle and if you want continue a position VS the computer. I create many position (starting game) to practice my theoric endgames. And I repeat... all this useful stuff are totally FREE.
chess.com v/s other chess sites.

The private groups are a nice feature of chess.com
For other features, there are better options out there.
Let's start this debate- Is chess .com the best chess site in the world? If yes, why? If not, which sites are better? I personally feel that is better [Please don't advertise any other websites here -MOD] and cheaper than chess.com. You all can post your opinions.