Pay attention to mysql/mariadb, sintax changed?

Question

I have a vps with mariadb and one virtual machine with mysql, i use in php code and in terminal. Both does not support sintax like that:
SELECT column_list
FROM table_name
WHERE condition;
You must write whit this symbol: ` .
Example:
SELECT `id`,`email`,`password` from `accounts` WHERE id <= 5;
If you don't, you will get an syntax error.
All of this course on SoloLearn it is not wrong, it is really good, but pay attention to the syntax.

Answer 1

and in sololearn its not mysql or mariadb (which is mysql), its sql which IS different, just similar