Learning something online these days is all the rage, and not just because it’s an easy way to kill a few spare hours. Online courses allow you to learn a new skill, on your own time, and without the traditional tuition costs that come with upgrading your education. In fact, free online courses from Udemy and Coursera let you improve in a certain area with no investment — well, except your time. And since the courses range from one hour to over 20 hours to complete, you can decide just how much time you want to put in.

Looking to explore other options than the ones below? Sites like Udacity or edX have thousands of other lessons you can peruse.

Learning to code isn’t just important if you want to be a programmer or designer. Being able to speak a coding language will help you advance in your career because you’ll be better able to translate your ideas into stunning HTML, JavaScript, and CSS reality. Whether you’re ready to start designing your own website, looking to learn the basics, or advance your existing knowledge, these free coding courses are there to help.

Thinking of starting your own business or taking on a new role in a growing company? You’re going to have to learn a lot in a hurry, so get a head start with a free online course. Essential skills in the modern entrepreneur’s toolbox include social media marketing, crowdfunding, and even drop shipping, all of which you can investigate through the following courses.

A great image can speak a thousand words, and that doesn’t just apply to photographs. For creatives of all kinds, learning more about your craft can elevate your art and help you create more meaningful and powerful images. Doesn’t sound too bad, does it? Give any of these courses a try and see what inspiration comes to you.

Productivity is a skill that you’ll cherish for the rest of your life. Being a productive person lets you tackle tough tasks more confidently and gives you more time to enjoy the things in life you really want to spend your time on. From reading and writing more efficiently to learning how to focus, these courses have you covered.

Health and wellness are about more than just diet and exercise. They’re about feeling empowered mentally, emotionally and physically. No matter what aspect of your life you want to improve, these lessons will help you take steps toward a more fulfilling existence.

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Updated on January 1, 2019: Revised the introduction and category introductions, added new coding, business, productivity, health and self-improvement, and photography courses.