I’m making a FAQ for this, but it’ll be the same as what I write here so that you don’t have to try and navigate around everywhere.
There are many types of guys, but the two most common that you’ll run into are shy and that guy. A that guy is easy to identify because they are confident, sometimes over confident, outgoing, a bit of a player, maybe shows some sort of deep sensitive side that he keeps hidden (like all the movies portray etc.), and flirty. These guys love to flirt, with anything that walks, usually. This makes it difficult to see if they truly do like you, or if you’re just one in a long line of girls they flirt with. But they are not unlike other people, because though they might flirt with you, they will also try to go out of their way to talk to you. They will maybe show interest in performances or sports events you’re in, and if you’re not into those extracurriculars, they might ask what you do for fun etc. All in all, with flirty guys, try to notice everything that do besides flirt with you, because if they’re making enormous strides to really talk to you, they might want something more than a casual and flirty relationship.