To become a full stack developer i completed html, css & js etc... now what i'll do next? Angular+NestJS or React+Redux

Answer 1

What you mentioned is related to client side development, and you should definitely learn them(at least one of them) if you are serious about developing in the modern era.
To be a full stack developer however, you'll have to learn a server side technology as well, be it Node PHP, python or anything such.

Answer 2

Thank u brother