Go to http://www.w3schools.com/ and read the HTML, Javascript, PHP and CSS tutorials. After you *fully* understand them try to make a cool website (without WYSIWYG). If you don't know how to do something, use Google and the reference of the language you are working with on w3schools.

I recommend installing Apache HTTP server if you want to learn PHP & MySQL.

If you want to make professional & interactive websites learn AJAX.

Good luck!

PS: Sorry for the bad English.

Yes, learning advance webprogramming languages will improve your confidence in webdevelopment industry. I will advice you to decide your niche first.. ie web-designing or web-development ?
based on your interest & skill go with one !!!
All the best