This site is intended to walk you through how to do Web development.  It is not so useful to go back to and find out how to do something specific.  So you need a way to find out specific information about specific HTML elements.

It is tempting to just do a search on the Web for answers but be careful.  Don't trust any results unless you are sure that they are up-to-date and written by someone who is competent.  They might still be talking about XHTML or HTML v4 or repeating stuff they heard in the pub.

To avoid the risks you could just use w3schools.  It has it's critics but it's a start and it is fairly well structured once you know the basics.  Feel free to explore other sites and choose the one you like best.