what is the best anime to start

In my opinion, the best anime to start with is Dragonball Z. I loved it as a child. Otherwise, I would recommend One Piece.

Maybe Full Metal Alchemist: Brotherhood, is really good. Or the classic Death note, was my first anime and maybe the first of much others.

i started with one punch man you can try it

This depends on which genre you're more into, for example do you like more action? Or do you prefer more psychological animes? Or maybe neither of them but romantic?
I would like to reccomend you this animes divided for genre so you can start which who you like the most.
ACTION: Boku no hero Academia, One punch man, Jujutsu no kaisen
PSYCHOLOGICAL: Erased, Neverland
ROMANCE: Clannad, Horimiya, Fruit Basket
COMEDY: Gintama, Blue sea

enjoy your journey!

naruto would be the best ideal choice if you are starting to watch anime, it is popular too

if you've never watched any anime, i suggest starting with naruto. also dragon ball might be decades old but it's a classic that can always be revisited because it's not complicated and it's about adventure mainly.