QR Code using React and Material UI

As I am starting my journey in web development and have some basic HTML, CSS, and JS behind me I am wanting to learn react with material UI especially since my main goal is to one day work as a MERN developer.

What are some best practices for organizing your react folder structure when you have components, themes, and assets?

Any comments on ways to better utilize MUI, especially in regards to styling? In vanilla css you have a .css file where you do all the styling but with MUI it seems very much inline.

Appreciate the feedback