State Management : Redux / Mobx / Flux / redux-toolkit
Routing : React Router
Styling : Styled Components, MaterialUI,Chakra,Tailwind.css, Bootstrap etc
Forms : Formik, React hook form
Testing :
Cypress → End to end testing
Jest → unit Testing
Misc:
TypeScript
Storybook
React i18Net
Firebase
Practical React libraries


Advance Topics:
Isomorphic
GraphQL
Higher Order Components
Render Props
Refs
Error boundaries
Portals
Http Requests : GET, PUT,POST,DELETE(fetch or axios)
Caching, Cookies, local and session storage 
Hooks
useContext
useReducer
useRef
useMemo
useCallBack
Custome Hooks