xslt - style sheet, javascript - ajax, web validation. so my problem is, where can i find more reference about how to properly learn all this?

First you need to know HTML, if you don't know that already. There are many good books out there, but my HTML learning days are long gone. Same for Javascript and CSS. But searching for learn HTML or learn Javascript should turn up many good results.

Ajax is just a javascript technique.

If you want to learn perl, you can either read "Learning Perl" (if you have no programming experience) or "Programming Perl" (if you are already familiar with other programming languages.