9 favorite websites to practice coding exercises until you're a MASTER:
9. Mode (SQL)
8. DataLemur (SQL)
7. LeetCode (Python)
6. Codewars (Python)
5. Stratascratch (SQL)
4. HackerRank (Python)
3. Kaggle (Data Science)
2. W3 Resource (pandas)
1. bnomial (Machine Learning)
