Play chess again

Hello everyone! First of all, I´m Spanish and my English isn´t very strong, my apologies.

I haven´t been playing for ten years. In that moment I had 2150 ELO FIDE and I was 18 years.

Now, I´m going to play again, on a serious way. I have been playing some rapid games (3´per player) here in chess.com and my rating is around 2000.

Two weeks ago I played in a normal game (2 hours at finish) against a guy who had 2060 ELO FIDE. Surprisingly for me, I won easily. But, I think that I need to go over again all my repertoire and probably improve my tactical calculation and my endgame theory.

What do you recommend to me? What has changed in the chess world in the last 10 years?

Thanks in advance!!

Just love chess)

I'm not as high rated as you but all I think you would need to refresh on is opening theory and maybe your tactics since you have not been playing for 10 years . Just curious why did you stop playing?