Show and explain how to work with a called database in JS

We need a person who will show and tell by example about the work of the database and JS. For example, I need to create a table in the database, a password and a login that I can transfer to JS, as well as make changes to the database (add or remove an account) also using JS. Condition - the user cannot access information from the database that was not called for transfer to the user. I take PHP/NodeJS/FireBase/MySQL as a link.

P.S. I need this in order not to study the backend as a whole, but to study only the specific branch that I need, for this I am looking for a person who will help to study this issue without going into the wilds of the backend.