Wanting to train new users how to use Peoplesoft Query and what basic primary tables to start with

I have been asked to create documentation for the purpose of helping users create Peoplesoft queries. I have been searching for Youtube videos to possible help the basic how to use query. I know Campus Solutions has many many tables in the database. What I was looking for is there was a documentation or something that could help me direct users to use certain primary tables when creating a query. Example: What are the primary table(s) to start with for the area of student admissions, student recruiting, financial aid, student financials, etc?

If anyone could point me in a direction and provide any information that could assist me with helping my new user understand how to create a basic query and what basic tables to use, this would help me tremendously.