Answer 1

This is a good question, first, I appreciate that you have taken the SQL course because it is related to your question, and it is a good start. You still need to advance your knowledge of the SQL language beyond what we get in the course here though, as we only get the basics here.

First, we need a database server installed, you will need one to practice with, you can use online SQL tools too if you so desire, but you'd need constant connection to learn. Then having the server installed, start practicing to write and execute the basic commands like create database, create, modify, delete tables and/or its fields, then move on to data manipulation, insert, update, delete records, from there you would probably start

Here are several known places where you can learn more, there are many out there, this is just some of what I found on top of the list:

https://www.w3schools.com/sql/
https://www.coursera.org/courses?query=sql
https://www.codecademy.com/learn/learn-sql

Finally, if you have doubts, go Google it up first, it worked for me most of the times :)

Hth, cmiiw