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Forget overpriced schools, long days in a crowded classroom, and pitifully poor results.

These websites and apps cover myriads of science, art, and technology topics.

They will teach you practically anything, from making hummus to building apps in node.js, most of them for free.

There is absolutely no excuse for you not to master a new skill, expand your knowledge, or eventually boost your career.

You can learn interactively at your own pace and in the comfort of your own home. It’s hard to imagine how much easier it can possibly be.

Honestly, what are you waiting for?

Take an online course

edX — Take online courses from the world’s best universities.

Coursera — Take the world’s best courses, online, for free.

Coursmos — Take a micro-course anytime you want, on any device.

Highbrow — Get bite-sized daily courses to your inbox.

Skillshare — Online classes and projects that unlock your creativity.

Curious — Grow your skills with online video lessons.

lynda.com — Learn technology, creative and business skills.

CreativeLive — Take free creative classes from the world’s top experts.

Udemy — Learn real world skills online.

Learn how to code

Codecademy — Learn to code interactively, for free.

Stuk.io — Learn how to code from scratch.

Udacity — Earn a Nanodegree recognized by industry leaders.

Platzi — Live streaming classes on design, marketing and code.

Learnable — The best way to learn web development.

Code School — Learn to code by doing.

Thinkful — Advance your career with 1-on-1 mentorship.

Code.org — Start learning today with easy tutorials.

BaseRails — Master Ruby on Rails and other web technologies.

Treehouse — Learn HTML, CSS, iPhone apps & more.

One Month — Learn to code and build web applications in one month.

Dash — Learn to make awesome websites.

Learn to work with data

DataCamp — Online R tutorials and data science courses.

DataQuest — Learn data science in your browser.

DataMonkey — Develop your analytical skills in a simple, yet fun way.

Learn new languages

Duolingo — Learn a language for free.

Lingvist — Learn a language in 200 hours.

Busuu — The free language learning community.

Memrise — Use flashcards to learn vocabulary.

Expand your knowledge

TED-Ed — Find carefully curated educational videos

Khan Academy — Access an extensive library of interactive content.

Guides.co — Search the largest collection of online guides.

Squareknot — Browse beautiful, step-by-step guides.

Learnist — Learn from expertly curated web, print and video content.

Prismatic — Learn interesting things based on social recommendation.

Bonus

Chesscademy — Learn how to play chess for free.

Pianu — A new way to learn piano online, interactively.