When making a website you want to make it as easy to use as possible. According to Venturi Web your website should be set up like a restaurant menu. Pasta goes with pasta, burgers go with burgers, etc. You want to make the most out of the content that you have. By putting your website into different categories you make it easier for the consumer to navigate and find what they need.
The right way to do this would be if you are a hair and make up salon you could make sub categories of what services you offer. The wrong way to do this would be to list everything thing that your salon does on the homepage. That can be overwhelming to the consumer and be way to much for them to have to read through to find what they want. A website should have three main pages, a homepage, an about page, and then an extra page to showcase a little bit of your personality. This really helped me when trying to put together my homepage. It gave a lot of detail on how to organize and make the most out of my website.