HackerRank 30 Day challenge to brush up my coding skills. Presently, I prefer completing it in Python. But, I plan to add them in Java and C++ as well.
You can find the challenges here : HackerRank - 30 Days of Code
30 Days of Code is an opportunity for you to learn how to code or brush up on your fundamentals. Each day, you'll unlock a new challenge and a corresponding video tutorial to help you learn.
The tutorial is Java-based, but you can also choose other popular languages to submit your solution. Topics include if-else statements, recursion, data structures and more.