What are the tips to know if a girl likes me

Well, first how did you meet? Do you talk on the phone? Do you have mutual friends?

Well, here are some signs that I can't give you with out knowing all the details:
She laughs at all your jokes
She smiles when you enter the room
She plays with her hair
She may give you eye contact but if not she may be shy
She will move closer to you when your out
She will actually call you to see how your day is going
She will offer you some sort of gesture that she likes you

Women are pretty straight the point and we do hurt guys feeling sometimes but, when we like you.you will know and you won't have to guess. Its pretty cut and dry.

If she flirts with you, always seems to be very close to you, or when you talk about other girls she seem to get jealous

my first advice is: don't scare her away.
i hate that question. I hate to be told when they like me. its not a conscious decision. it just scares me away, and I hate that I never have a good answer.
but that's a tough question to answer because I don't know what type of friend she is. signs are different depending on the type of friendship you have. if your already close to her most the time you can tell by what she says. listen for things she says about guys. if she talks to you about guys tat like her but she doesn't like them back, chances are she likes you. she wants to see how you will react. that's her way of finding out if you like her by seeing what your reactions are, or what advice you would give (ex. oh why don't you like him? you should go for it- she would assume you are not interested) good luck