Now, you may be asking yourself, well, what does one study about insects, anyways?
The answer in short, is well, everything.
But in a long explanation? Entomology focuses a lot on how insects work, move, how do they interact with the enviroment, their evolution, and so on. But, you don't have to be a scientist to be an entomology, nor, necessarily study to become one. Nowadays, a lot of entomologists are people who have the hobby of studying, keeping and collecting bugs. You probably have seen cases with dead bugs pinned inside, the ones usually kept in museum or shown in media when trying to make a "spooky" scene (I am directly looking at you Tinkerbell saga), well, you may be surprised to find that a lot of people keep dead insects as a hobby.
And I'm here to tell you, well, not if you don't want to.
The beauty of a hobby is something that brings joy, and if you don't want to keep dead bugs, you don't have to! Some folks prefer to breed insects and keep them as pets (like ant farms, for example), others prefer to just read about insects (and it is a VERY interesting topic, there's a bug for everything you can practically imagine!), others keep a collection but, instead of dead bugs, they keep photos of insects they find (a digital collection, one that has been rising in popularity over time). People I've known, that call themselves entomologist, just like to draw insects, or make pins, or write about them Maybe it's not exactly the same as those who profesionally study insects, but it's still the study of insects, even if it's for fun.