Look at using Tailwind and styled-components (or another styled library) to build better unique UI's without using bootstrap.
- https://tailwindcss.com/docs/extracting-components/ (why to write custom components using HTML only)
- https://dev.to/ryanlanciaux/tailwind-with-react-2ncl (how to use styled to avoid a React mess of attributes)
Main issue, standard responsive sidebar+nav header. You know, that design that hides the sidebar on small devices unless you click the header button.
- https://tailwindcss.com/components/navigation/ (nav bar only, no sidebar)
- https://www.tailwindtoolbox.com/starter-templates