10 websites where you can learn anything for free:

1. Udemy

Udemy is an online learning and teaching marketplace with over 185000 courses and 49 million students.

Although most of the courses were premium on this site, some of them were available for free.

https://t.co/jU3ZSQ05Vk
2. Edx

EdX is a learning platform that gives students from any country the opportunity to take free online courses offered by premier Universities such as Harvard and MIT

https://t.co/53C9apcLYW
3. Instructables

Instructables is a website specializing in user-created and uploaded do-it-yourself projects, which other users can comment on and rate for quality.

https://t.co/5EphUXDX3D
4. Cooksmarts

Cook Smart is the exciting way to learn new recipes & improve cooking skills while using any device. Learn from top-notch professional chefs.

https://t.co/imc0hioTVE
5. TedEd

TED-Ed platform allows users to take any TED Talk, TED-Ed Lesson or educational video and easily create a lesson plan of customized questions and discussions.

https://t.co/jxxrGixHbD
6. Khan Academy

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more.

https://t.co/NhtUpGbd2b
7. Skillshare

Skillshare is an online learning platform with thousands of creative courses and classes taught by experts to help you learn new skills.

https://t.co/dwcmFhJibH
8. OpenLearn

OpenLearn create hosts collections of courses created by teachers, colleges, universities, organisations and individuals from around the world.
https://t.co/mMqFWD9380
9. FutureLearn

Join millions of people learning on FutureLearn. Find online courses and degrees from leading universities or organizations and start learning online today.

https://t.co/MpgUEiaQ3y
10. Degreed

Degreed is the upskilling platform that connects learning, talent development, and internal mobility opportunities in one place.

https://t.co/wJnOsKFsal

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A brief analysis and comparison of the CSS for Twitter's PWA vs Twitter's legacy desktop website. The difference is dramatic and I'll touch on some reasons why.

Legacy site *downloads* ~630 KB CSS per theme and writing direction.

6,769 rules
9,252 selectors
16.7k declarations
3,370 unique declarations
44 media queries
36 unique colors
50 unique background colors
46 unique font sizes
39 unique z-indices

https://t.co/qyl4Bt1i5x


PWA *incrementally generates* ~30 KB CSS that handles all themes and writing directions.

735 rules
740 selectors
757 declarations
730 unique declarations
0 media queries
11 unique colors
32 unique background colors
15 unique font sizes
7 unique z-indices

https://t.co/w7oNG5KUkJ


The legacy site's CSS is what happens when hundreds of people directly write CSS over many years. Specificity wars, redundancy, a house of cards that can't be fixed. The result is extremely inefficient and error-prone styling that punishes users and developers.

The PWA's CSS is generated on-demand by a JS framework that manages styles and outputs "atomic CSS". The framework can enforce strict constraints and perform optimisations, which is why the CSS is so much smaller and safer. Style conflicts and unbounded CSS growth are avoided.