How many openings are there in chess and which is the best opening for you?

There are 1000s of chess openings. I believe chess.com lists 3000 named openings. There are certainly more, as not all openings and variations are named.

For me, the best openings are:

White

• Ruy Lopez
• Open Sicilian: Bg5 Najdorf, Richter-Rauzer

Black

• Sicilian Najdorf
• Nimzo-Indian
• King's Indian

I believe so too. I already found over 1,500 myself. It includes all variations and established opening lines.

Is there any 'contents' page on chess.com that lists all the openings in their database?

https://www.chess.com/openings  Maybe here

As mentioned above there is an opening listing. There is no opening counter though so it's hard to tell how many there are. I just looked up that it lists 3000 lol.

I started a list here: https://lichess.org/study/jxNZZROM

It's difficult to track all the different variations and transpositions. The Ruy Lopez has an absolute mountain of variations.