QoftheWeek - What's Most Confusing About Website Builds

This week I'm wondering what confuses you most when it comes to having a website built (or rebuilt)? Is there a term, a phrase, or technology that you find confusing or maybe even a little scary? Please let me know what it is in the comment section.

Besides compiling all the answers as usual, I will also try to explain the confusing material.

Results from the last QoftheWeek: Have you ever used a DIY website builder? Well, believe it or not, this is the first question that we had NO answers for. Maybe those platforms are not as popular as the commercials would have us believe. Here's the link to that question, if you'd like to answer in now.