Ask HN: Best resources for daily machine learning coding practice?

I'm a math student interested in ML research, with very basic coding skills. I realized that for a good understanding, it's necessary to have a regular programming practice. As this is my secondary interest, and I'm almost a beginner now, I can't try implementing new papers. Does there exist daily coding challenges or a list of problems or something that would keep me on track and help me build better understating in ML?