Caches settings (nginx cache + opcache + wp super cache plugin)?

Question

caching

Hello everybody!

Perhaps the questions will seem stupid or bogey to you, please explain to the "fingers" about the cache.

Moved from virtual hosting to DVS (my referral, with a discount for the first month for you https://firstvds.ru/?from=993821 or promotional code 648993821), sites on Wordpress, I use such a bunch of caches: nginx cache + opcache + wp super cache plugin.
I understand that there may be questions about setting up each cache separately, but:
1) Is this scheme correct in general? Maybe the server cache nginx cache + opcache or another bundle of nginx cache + wp super cache plugin is enough?
2) Maybe with such a structure nginx cache + opcache + wp super cache plugin I no longer speed up, but slow down the site?
3) How to properly cache wordpress sites on dvs?

Thank you.