Is this everything I need to know about Json and Ajax before diving into asynchronous js?

Question

I've watched some tutorials about json and ajax and summed what I understood in this code. Is it enough for a beginner?
https://code.sololearn.com/WiNU93XBv50h/?ref=app

Answer 1

Richard

That is enough for a beginner. Now try to learn about how to insert data using JSON or Ajax and how to get data on the basis of parameters.

Answer 2

I ᴀᴍ "Tɪᴍᴇ" I have searched something about what you have said and I've noticed that has something to do with databases. Is my search right? In that case to do what you have advised me, should I learn something about database first?