Codewars

Codewars organises programming exercises for different experience levels, helping developers work through challenges and compare approaches within a community of learners and practitioners.

It is useful for exploring a subject, learning activity or skill-development goal. Its focus includes Coding challenges, Programming practice and Developer community, helping a learner connect the broad educational offering with the individual course, level or format relevant to the learning enquiry.

On Codewars, the study and learning areas shown on the official site include Python and SQL.