Thumbs Up for enthusiasm :)
Started with HTML in 95.
Then learnt ASP, which I dumped as soon as I found PHP (php3).
Been LAMPP mostly since.
I use Codeigniter exclusively for all of my projects (pretty much since they released CI 1.3).
Magento for stores.
jQuery and Bootstrap are staples now.
As previously mentioned, you can output plain text from PHP so you could just use only PHP for a website, but it would not look very nice, and there would be no on page functionality at all. Not even basic stuff like clickable links. Just text.