1. Use Nouns to represent resources / Not Verbs
2. Use Pluralized Nouns for resources
3. Use hyphens (-) to improve the readability of URIs
4. Use forward slashes (/) for hierarchy but not trailing forward slash (/)
5. Avoid using file extensions
6. Version your APIs: http://api.example.com/v1
7. Use query component to filter URI collection: http://api.example.com/v1/store/employees?department=IT&region=USA

There is an alternative to the SPA model: a new model with HTML only. It uses modern DOM-swapping interactivity libraries like Hotwire, HTMX, and Unpoly and... something that returns HTML as backend :)

Since version 7.0 has Ruby on Rails Hotwire backed-in!