HTML is the basis of more or less everything you see on the web, if you want to do any kind of website design then you’re going to need to understand HTML. That said, it’s not the end of things if you want to do something clever with a website. That could bring in CSS, scripting (server side or client side), interacting with a database… more things than you’re going to get from HTML 101.

But seriously, learn HTML. It’s far too common that people make very special websites that try to do things “the clever way” (and end up being incredibly stupid) because they’re enamoured with what they can do with the fancy tools and overlook the easier, simpler, more compatible way of doing things in HTML.

On the other hand, if you’re a business admin major maybe you’re not going to be getting into the guts of web design. Might be easier just to get a “web guy” to do it and make use of his specialism rather than do it yourself. Depends what you want a website to do… I’ve seen perfectly good websites in strict HTML and incredibly ****ty ones with all the bells and whistles, but also the reverse.