One of the best websites for the young webmasters is w3schools.com. It’s great because you can learn from the beginner levels to the expert levels. You choose a client side language and then learn from its examples in each chapter and you can edit into the code just on its web pages. It has good some points and weak points.
The good points include the fact that there are lots up-to-date languages you can learn to such as the HTML5 and the CSS3. In addition, you can choose the way: web designer or web developer, depending on your interest and talent. Another good feature is that you can earn the credential web certificates on the web with very low prices. Also, in my experiences on this web is I never found the errors on it and it is very easy to navigate.
One of the drawbacks is that the color of the website, it is a dull color for young people. Another bad point is that there are the advertising on the website. However, you can just ignore it.
To sum up, I think this is a best website if you are a young webmaster and you want to improve your web skills. You should not ignore it.