Learn SQL hands-on, from first principles, for free.
Understand the fundamentals of the language, rather than copy-pasting examples from StackOverflow.
Problem-solving is the best way to learn. After reading the concepts, you can use them to solve coding challenges.
See what kind of practical uses these concepts have. These tutorials use scenarios real people might encounter.
No need to pay for anything. Read the tutorials and make attempts at the challenges for free.
Learn how to wield data for your purposes using SQL. Data is everywhere and learning how to control it is only becoming increasingly important for people in all industries.