I've coached and mentored thousands of photographers and I see this common mistake all the time. For example your a portrait or a wedding photographer, but your portfolio has portraits, headshots, commercial, architecture, pet photography etc. Here is why that is a bad idea.
It's frustrating for the site visitor who likely came to your site because they are in the market for one type of photographer. Not only does this turn off and turn away site visitors but it also devalues your brand. Remember this specialist command a higher price. When you have all sorts of photography in your portfolio it makes you appear to the visitor as a non-specialist. AKA a general photographer.
If you're trying to figure out which type of photography you want to pursue then set up completely separate websites for each of those portfolios, don't mix them together and don't get lazy and just separate them by gallery titles.
The sooner you can focus on your specialty the faster you will learn the ropes and build momentum in that genre or niche of photography. The worst thing you can do with your site and your energy is to try to please everyone and do everything. That's a recipe for disaster and burn-out!