This website looks rather outdated (prageruniversity.com), and we want to modernize it (rebuilt it - in a way that will be very "wow").

I won't go into details, but we are having some sort of a short circuit in our staff, and our web guy kind'a disappeared on us.

I am trying to figure out some stuff, and would love to get your input.

A site like this (has YouTube videos, accepts donations, has a blog, has option to buy shirts - so it has a cart and a checkout and accounts, and so on)..... what language would you use for such a site? Is PHP the best solution? Or can we use HTML?

I am very layman when it comes to this, but I was told PHP is faster because it runs on the servers instead of the personal computer of the user?

The site has about between 2,000 to 5,000 visits per day and growing. In case this is relevant to the language as well.

Any advice would b