What you have been doing online? Probably, you have been looking out for news, doing shopping and general stuff online. But it's quite different if you are a blogger or person deals with the back end of a website. There you need to be knowledgeable in web design and development technologies. If you are really into web designing and development, or made the choice to start your career in that pathway, you may have enough knowledge about them. But if you are a newbie to web, how do you gonna start with?
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Also there you can find lot of related examples to check out and learn how to use them properly. W3School let you know definition and usage of code, important notes about code and more such as for HTML - Attributes and events that can be used with codes, what major web browsers support that code. Instead of static information, W3Schools offer "Try it Yourself" editor where you can experiment with codes and see result of your experiments instantly. It's more worthy than just a information source too. You might able to save money by learning and most important thing is you are investing your time to learn about it. So, what you gonna learn about?
There is no prerequisites involved. Just go over to W3Schools website and start with what you would like to learn. If you have no idea, HTML and CSS are best to start with.
* Make use of the website search bar to find necessary information.
* If you have a doubt or couldn't find what you have been looking for, then you can use W3Schools Forum to ask questions and solve your issues related to web development technologies.