There are quite a few sites from where you can learn a ton of things

• Udemy: Online Courses Anytime, Anywhere
• Coursera - Free Online Courses From Top Universities | Coursera
• MIT open courseware: Free Online Course Materials
• Stanford open courseware: Stanford Online
• Youtube has lots of lectures, but you have to search a little harder, with targeted search.
• Code Academy: Learn to code
• Stack overflow: Stack Overflow
• Lynda: Online Video Tutorials & Training
• Tutorials point: Tutorials for Clojure, Aurelia, CoffeeScript, CPanel, Laravel, SAP Webi, MS SQL Server, pinterest, Indian Polity, Teradata, Windows10 
• Quora: Quora.com
• Kaggle: The Home of Data Science
• Wikipedia: Wikipedi
• Harvard Business review: Harvard Business Review - Ideas and Advice for Leaders
• Engadget: Engadget | Technology News, Advice and Features
• Nature Magazine: Journal home : Nature
• Science Magazine: Journals | Science | AAAS
• Management lessons: List of Free Online Management Courses and Lessons
• ExLinks: Express links: Archive
• CEO Express: Business portal for executives created by a busy executive.
• Khan Academy: Khan Academy
• EDX: edX