Multiple user different crud data

good evening, I want to ask if anyone has a tutorial on how to make a multiple user view where later each user will have a different view where each user can do crud without seeing the crud data from other users. Thank you

In each table add a column userId and for all database operations add a WHERE clause like this

... WHERE userId = <current user>


are you have some tutorial about this?

try a Google search

thankyou, i will try it