I know too many backend developers who are stifled by one glaring phobia: CSS. How do you construct a layout when nothing lines up? Every browser renders your code differently. Floats constantly break. Nothing works!
If you agree, your thinking might be a bit out of date. You'll be happy to hear that the ecosystem is vastly better than fifteen years ago. This series is specifically for backend developers who understand the basics, but need a fast primer on modern CSS that they'll actually use in their day-to-day workflow.
React Native Navigation is a module, dependent on and intended to be used alongside React Native, so some experience with it and knowledge of core concepts is required. If you feel the need, you can start with their getting started tutorial, and then come back here when you're ready.
Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects", which can contain data, in the form of fields (often known as attributes or properties), and code, in the form of procedures (often known as methods).