The hottest web technologies currently are HTML 5 and jQuery, any experience in those will set you up for gaining good experience.
Most professional web development follows a polyglot approach to web technologies, professional web developers value productivity most, as they generally have high work loads and tight deadlines, as a result professional software developers favor frameworks more than amateurs.
The web sites that you build as a professional, are also on a greater scale and have different functional requirements that page for granny to sell biscuits.
Look to mainstream computer languages and their associated web frameworks, Java - JavaFX, Java ServerFaces ; .Net - C#, ASP.NET MVC.
Add to that solid HTML, java script (everyone rather uses jQuery these days as it gives you that productivity boost I was talking about) and you are A for Away.