A highly reputable research magazine, often the first to report major scientific breakthroughs outside of the original research papers. Their articles may take a bit of time to digest, but contain some of the most exciting propects of modern science.

Difficulty: Advanced

Cost: Free

Content: Maths, Physics, Biology, Computer Science

Wikipedia but reliable. Britannica Encyclopaedia is the oldest continuously published encyclopaedia in the world. First published more than 250 years ago, it has long since become one of the most exhaustive and reputable sources of information. On their website, you can read about everything from linguistics to particle physics.

Difficulty: Moderate to advanced

Cost: Free

Content: Pretty much anything you can think of

Frontiers, a prestigious journal publisher, has started a journal for kids - edited by kids! Go read some beginner-friendly articles on cutting-edge science written by some of the leading scientists in the world.

Difficulty: Beginner

Cost: Free

Content: Scientific research

Although it's a physical museum. The Smithsonian National Air and Space Museum's website also has plenty of articles to read and photos to look at. Learn everything about the history of aerospace and it's prospects for the future.

Difficulty: Moderate

Cost: Free

Content: Aerospace

A guide to everything related to the universe and more written by NASA. Each article comes in multiple difficulty levels, which you can switch at the click of a button.

Difficulty: Low to moderate

Cost: Free

Content: Mostly astronomy and other related sciences.

Exactly what is says on the cover. Science News is one of the premier news sites for anything related to science as well. They have a kids' section as well if you're looking for more digestable content.

Difficulty: Suits almost everyone

Cost: Free

Content: Science news

Comprehensive coding tutorials for most of the popular coding languages right now. Text-based content makes it perfect for searching up quick information on something you don't know.

Difficulty: Beginner to Intermediate

Cost: Completely free

Content: Coding-related

MIT, widely known as one of the best STEM universities in the world, has published most of it's courses in online form on MIT Opencourseware.

Difficulty: Intermediate to advanced

Cost: Completely free

Content: Most courses you would find in university, from African Studies to Material Science

Online course platform with content from world-renouned universities. Many courses are live, which makes for a more personalised, but less flexible, experience.

Difficulty: Intermediate to advanced

Cost: Some courses are paid

Content: Mostly STEM-related, university-level courses

Free online video lessons made for high-school students. World renouned for being extremely high quality and intuitive. Covers almost all school topics, including advanced classes.

Difficulty: Beginner to intermediate

Cost: Completely free

Content: Covers virtually everything you will need to matriculate and some more

Learn all the coding skills you need here. Courses are modularised so you can pick what you want to learn.

Difficulty: Beginner to advanced

Cost: Mostly free, some content requires premium subscription

Content: Coding courses and communities.

One of the most renouned online course platforms in the world. Has many courses from well-known companies and presitigious universities. Many courses are accessible for free.

Difficulty: Moderate to high

Cost: Many courses are free, but require payment for completion

Content: Mostly STEM-related