Stepik: online courses

Stepik is a programming app that helps you learn new programming languages, data structures, and statistics. They also have a community where you can interact with other students, ask questions, and get answers from other students. Stepik has over 300 online courses dedicated to computer science and technology. You can learn data structures, Python programming, statistics, and many other useful skills while you are on the go. You can also download lectures to study whenever you want. Stepik has a calendar where you can easily import the deadlines for future reference.