What lessons will help me improve my skills to solve my problem?

Question

MongoDB

Good day friends!
Plz advise lessons that can improve my skills for solving the problem on the question
Lessons in English are also suitable

Answer 1

SQL.
The data is relational, it's best to move to an RDBMS like PostgreSQL or MySQL.
Otherwise, you will have to bind data in the application logic, which is inconvenient and costly.
You are using MongoDB for other purposes.