I learned Java, MySQL, and Python from HackerRank for Developers. I like how it organizes all the problems in order of complexity and learning. I can go step by step with easier ones at the start, and the complexity increases as I progress. The discussion section for every problem is great because if I'm stuck, I can get a hint or find a solution. HackerRank for Developers also has built-in questions that are ordered, unlike Programiz, which just provides a compiler. The initial setup was easy, just some simple clicks. Review collected by and hosted on G2.com.

Sometimes the learning curve goes steep high. Like sometimes a question teaches you how to print and the next question goes to peak data structure and algorithms. Review collected by and hosted on G2.com.