What's a good website to study recent grandmaster games? I would like to study some opening theory on the Grand Prix Attack. What is a good website to study recent grandmaster games?
Chessgames has all the games from recent top GM tournaments.

Chess24 has live transmissions of the top tournaments.

And the Opening Tree at Chessok has opening variations with statistics and engine evaluations.

You can also find a lot of opening material on Chess.com, ChessPub or blogs like the Kenilworthian.