Life skill
https://www.artofmanliness.com/
For Curious people!!!
TED/TED-Ed— spreading ideas, usually in the form of short, powerful talks
Curiosity — hundreds of thousands of quality videos for your interests
Investopedia — largest financial education website in the world
Open Culture — compendium of free learning resources
HowStuffWorks — explains thousands of topics, from ESP to lock-picking
Popular Science — magazine on current science and technology
AEON — profound and provocative thinking for the web
The Atlantic — We know it’s a curveball… but it’s awesome!
Book of Life — for the most substantial things in your life
Matter — Award winning publishing platform and studio for storytellers
For Blog Lovers
Wait But Why — a stick-figure-illustrated blog about almost everything
Brain Pickings — an inventory of cross-disciplinary interestingness
Backreactions — theoretical physicist on recent news in physics
You Are Not So Smart — an attack on common misconceptions we all have
Hello Internet — Brady Haran and CGP Grey discuss. It’s worth listening.
Whizzpast — a very impressive history blog read
Barking up the wrong tree—science-based insights on how to get ahead
20 Minute VC — Want to get funding or begin a career in VC? Start here!
For Social butterfly
Quora — connecting people who have knowledge to the people who need it
Socratic—Answers and content from a huge community of teachers
Declara — discover, collect, and share knowledge with like-minded people
Stack Exchange— expert Q&A communities, including Stack Overflow
Zooniverse — world’s largest platform for people-powered research
Instructables — user-created and uploaded do-it-yourself projects
Academia — Share and discover academic papers on all topics
Free and paid cources!!!
Coursera — getting you access to the world’s greatest education
Highbrow — 5-minute courses brought to your inbox every day
Udemy — follow courses on yoga to photography–and much, much more
FutureLearn — go through courses from universities and cultural institutions
MIT OpenCourseWare — virtually all MIT course content
Udacity — acquire skills through series of courses and hands-on projects
edX — access high quality education, including from MIT & Harvard
Codeacademy — learn to code interactively, for free
Khan Academy — work on the skills you choose at your own pace
Academic Earth — free college courses and ongoing series of original videos
Chesscademy — free online lessons for those keen to play chess
How to start a startup — The best one-stop-shop for entrepreneurs

Can you please share more links for productive sites for courses and training?