Whether you’re an experienced programmer or a beginner interested in diving into the tech field, online programming courses can help you gain new knowledge. Careers in programming are becoming increasingly desirable in today’s tech-savvy world, and luckily, you don’t have to go to college to develop this skill.

The best online coding courses allow you to learn from home, work on a flexible schedule, and receive feedback from both instructors and fellow students. Additionally, many courses offer a variety of topics, from introductory lessons to game development and data management. Here, we’ve rounded up our top picks to help you choose the right course for your needs.

The HarvardX CS50 Introduction to Computer Science course is completely free for students, but an optional certificate of participation is available for $149. With an online community for help and specific assignments for each topic, this course is best for students to gain a solid working knowledge of coding.

If you’re looking to dive into coding, this course stands out from the crowd. Harvard has put its most-visited course, CS50 Introduction to Computer Science, online, and it’s completely free unless you want a certificate of attendance for $149. Not only does the course offer video recordings of every lecture, as well as additional videos explaining certain concepts, but it also has an assignment for each block of content. You can check that your code is up to date before you submit it using the cloud-based IDE that complements this course, and there’s a large community to interact with if you run into any issues.