5 sites below can help students to further research on Web Development, most subjects are very interesting:

@ khmeracademy.org
As sites that are taught in Khmer first in Cambodia to gain support from the students who study in the district, which has many lessons for school or a library Internet (E-library) for studying a type of E-Learning, in whichWeb Development lesson videos that teach Khmer language such as: HTML, CSS, PHP, Javascript, jQuery, etc..
@ angularjs.org
Is the Web site of a new created by the staff of Google in 2009 and currently there are very popular in a language easy and features than tongues fans can also self-study through video and practiceon this angularjs own.

@ w3school.com
Is the Web site of a large in the world, with a deep interest from students that aims to be a web site developers or development sites (Web Developer) because it has, for example, and the answer existing for those who have just started studying can follow and feel that learning to understand yourself and theory lessons.

@ codeschool.com
A large web site that provides many options to learn lessons and videos easy to learn, but requires an account in order to maintain privacy and provide easy self-study:HTML, CSS, PHP, SQL, Bostrap(BS), jQuery, Javascript(JS).

@ codecademy.com
Requires that you must have a personal account in order to learn. In particular, you can also begin to learn by focusing on skills, Web Developer at once, with many options to learn, in part, also has a language key, which you can explore on their own, such as: HTML, CSS, PHP, Python, Ruby, and so forth. Moreover, you can also apply directly on it as well, and there are existing examples.