@inj4n we often call every small arthropod a “bug”, but actually that’s not true. Because taxonomically there is an order of insects that is commonly called true bugs, the order Hemiptera. Some groups that belong to Hemiptera are cicadas or shield bugs (Wanzen in German) for example.
To list the differences between “bugs” would be too much for this post, but when we stick with beetles and flies for example, we can say that beetles have two pairs of wings, of which one is hardened (elytra). Flies on the other hand have one pair of wings and a pair of reduced wings (halteres). This also distinguishes a fly from a bee, which has two pairs of wings.
(Of course, there are many more differences, but as I said, this would be too much to put in a post like this :D)

@inj4n @ShaulaEvans guess I’m always excited to tell people about the coolest bugs ever! (Although I love them all :3)

@ShaulaEvans rove beetles (Staphylinidae) are not only (one of) the largest family in the animal kingdom, but they use their abdomen to fold their wings under the shortened elytra.
In fact, their wings have distinct folding lines, but it doesn't matter if the left or the the right wing is on top of the other while folding.
https://www.youtube.com/watch?v=HhU9NhHIYQc