learn online coding for coder programmer

Website	Course	Feature	Pricing	Difficulty
Codecademy	HTML, CSS, JavaScript, jQuery, PHP, Ruby, Python, API	Code Interpreter, Progress Saver, Project, Forum	Free	Easy – Intermediate
Code Avengers	HTML5, CSS3, JavaScript	Code Interpreter, Progress Saver, Project, Note	Free	Easy
Code School	HTML5, CSS, CSS3, jQuery, Ruby, Ruby on Rails, iOS	Code Interpreter, Screencast, Progress Saver, Forum	Free, $25/month	Intermediate – Hard
Treehouse	HTML, CSS, CSS3, JavaScript, jQuery, Ruby, Ruby on Rails, iOS, Android, UX, Database	Code Interpreter, Screencast, Progress Saver, Project, Forum	Free, $25/month, $49/month	Easy – Hard
LearnStreet	HTML, CSS, JavaScript, Python, Ruby	Code Interpreter, Progress Saver, Project, Forum	Free	Easy
Udacity	Web Development, HTML5, Python, Java, Computer Science, Algorithm, AI	Code Interpreter, Screencast, Progress Saver, Forum	Free	Intermediate – Nightmare
CodeHS	Problem Solving, JavaScript, Animation, Game Programming	Code Interpreter, Screencast, Progress Saver	Free, $25/month, $75/month	Easy – Intermediate
Khan Academy	Programming Basics, Canvas Drawing, Animation, User Interaction	Code Interpreter, Screencast, Progress Saver, Project, Discussion	Free	Easy – Intermediate
Scratch 2.0	Visual Programming	Visual Editor, Project, Forum	Free	Easy
SQLZOO	SQL	Code Interpreter	Free	Easy – Hard

 Best
https://www.hackerrank.com/categories/algorithms/warmup

Top Coder

TopCoder is the world’s largest competitive software development community spread over 200 countries and 272,348 members. The site hosts online programming contests in the Java, C++, and C# languages. Fortnightly online algorithm competitions and weekly competitions on design and development are platforms for coding skills. The algorithm based contests are usually the shortest (2 hrs) while marathon matches can go on for couple of weeks. The codes from design and development contests are usually picked up by companies for a profit. TopCoder.com sometimes serves as a hiring platform for developers.

Codechef

Codechef is a noncommercial programming community that’s Indian in origin but global in scope with nearly 25,000 members. The programming community hosts contests, trainings and events for its worldwide membership. Codechef is well organized with local chapters in colleges, meetups, an active forum, blog, Facebook Group and a Twitter stream. You can practice your problem solving skills on the site and then take part in the monthly face-offs.

Apps for Development

The World Bank attempts to foster social innovation by asking the developer community to develop software applications related to one or more of the Millennium Development Goals (MDGs). You can submit any kind of software application, web apps, a mobile device, console, SMS, or any common software platform. The only condition is that the proposed application use one or more datasets from the World Bank Data Catalog available at data.worldbank.org. You can still participate before January 10, 2011.
Another city specific example is the NYC BigApps 2.0 Competition which is for New York City.

Facebook Engineering Puzzles

The engineering puzzles are placed on the Careers page on Facebook, so it could be an entry ticket to a job at Facebook. But you have to solve them and get them right first, because as this old blog entry explains competition to get into Facebook is pretty intense. The Facebook Puzzle Master Page also holds frequent contests that can help you get noticed.

HTML5Contest