Udemy.com is an online learning platform. It is aimed at professional adults. Unlike academic MOOC programs driven by traditional collegiate coursework, Udemy provides a platform for experts of any kind to create courses which can be offered to the public, either at no charge or for a tuition fee. Udemy provides tools which enable users to create a course, promote it and earn money from student tuition charges.
No Udemy courses are currently credentialed for college credit; students take courses largely as a means of improving job-related skills. Some courses generate credit toward technical certification. Udemy has made a special effort to attract corporate trainers seeking to create coursework for employees of their company.
As of 2017, there are more than 55,000 courses on the website.
Udacity is a for-profit educational organization founded by Sebastian Thrun, David Stavens, and Mike Sokolsky offering massive open online courses (MOOCs). According to Thrun, the origin of the name Udacity comes from the company’s desire to be “audacious for you, the student”. While it originally focused on offering university-style courses, it now focuses more on vocational courses for professionals.
Tutorialspoint.com is a dedicated website to provide quality online education in the domains of Computer Science, Information Technology, Programming Languages, and other Engineering as well as Management subjects. This website was launched by an AMU alumni, Mr. Mohtashim, with a single tutorial on HTML in year 2006.
At present, this website is developed and maintained by Tutorials Point (I) Pvt. Ltd., which established on 12th June, 2014. (Twelfth day of June Two Thousand Fourteen), under the Companies Act, 2013. The CIN of the company is “U80904AP2014PTC094598”
4)From android only
officially designed by android
please one thing i clear you if you good reading or good catching power than you can learn from this site
If You want to really learn android than prefer google for learning type question in it if you are not getting than ask a question on stackoverflow.com or quora.com
How to make a camera in android (search in google )
You will find many links go through it