Is GeeksforGeeks a good site?
GeeksForGeeks is really a great website if you're interested in learning new concepts about Data Structures & Algorithms. Technically speaking, GeeksForGeeks has 21,018 webpages which contain a lot of potential information.
Is GeeksforGeeks a reliable source?
I found it fairly reliable. Not perfect, sometimes the explanations aren't super clear, but they do a pretty good job. I used it mostly for dynamic programming. They often showed the major important steps, like the recursive solution, the dp solution, and sometimes a clever/improved solution.
Is GeeksforGeeks practice free?
These courses provided by GeeksforGeeks are absolutely free and bring the best quality content be it video-based or theoretical. Each course has lifetime accessibility, is track-based, has assessments and practice sessions (to implement your learning), and is also updated.