No question is stupid when it comes to the opposite sex.
The great thing is tho we all know the basics!
You know someone likes you if they want to be around you, talk to you, etc.
And you know when someone doesn't like you. They'll ignore, avoid and stay away from you.
Like guys, women are all different! Some are shy and reserved, others are more confident and outgoing.
If a shy girl likes you, she'll show signs that are low key say... looking away if you notice her looking at you. Smiling & blushing when you pay her a compliment, covering her face with her hands.
On the other hand a confident girl will be more out spoken with her gestures. Hugs, pecks on the cheek, hand / arm touching and general flirting. (Don't mistake these gestures as a come on! unless you like being slapped!)
If you think a girl likes you and you like her! Ask her to do something that will involve the 2 of you. Invite her out with your friends, go for a drink of coffee, do an activity that is social and in public. If she accepts your offer and you both have a great time, let her know you enjoyed it and ask her if she'd like to do something else sometime. If you know her well do some of her hobbies she likes.
The over all thing I can say is just be yourself, don't go out looking for signs. Dont look at every girl you meet as a possible date. Be polite, respectful and don't be cocky or try to impress or show off!
Women know when a guy is trying to show off.
You could be the ugliest guy in town but here is the trick!
The beauty of attraction is it works on 2 fronts!
Looks and Personality.
You could be a brad pit and have the personality and attitude of a block of wood.
But if you can make a girl smile and laugh! She'll see beyond looks.