The transition from a spreadsheet to a relational database is a challenge. Good place to start:
https://nodegoat.net/blog.s/20/what-is-a-relational-database https://nodegoat.net/blog.s/21/formulating-ambiguity-in-a-database
@nodegoat is here to help, or come to a #nodegoat workshop 🙌 https://twitter.com/scott_bot/status/1072554705409269760