Multi page form with Typescript, React, Tailwind

The main point of me building this solution was to improve my knowledge of Typescript and React.

I'm completely new to both of these technologies, I'm mainly a backend developer (Laravel) and I've been using Vue.js for a number of years and felt it's time to improve my knowledge of frontend technologies, I used Next.js as the base install, however the functionality that I used from the framework was minimal, this was probably a bad choice.

I'm going to redo this using Styled Components and take on board any feedback anyone has.

Questions, queries, help

• Structuring the project, where do interfaces, types which are used throughout the project live?
• Taking a mobile first approach, I built the project with desktop in mind and then plumbed the mobile - I need to work on using mobile first.
• Have I missed out any best practices, packages that could have made my life easier?

Any feedback is greatly appreciated!