Even if you're shy, try extra hard to look into his eyes while you're speaking with him. This will show that you're engaged and really listening to what he has to say. Listening to him, and showing that you're interested, is an easy way to flirt without making it extremely obvious.
Flirting or coquetry, is a social and sexual behavior involving spoken or written communication, as well as body language. It is either to suggest interest in a deeper relationship with the other person or, if done playfully, for amusement.
Playfully tease them often and smile at them frequently. Make sure to never cross the line and never be offensive as this might hurt them and drive them away. Tell them they look nice or that you like their sense of humour. Compliment them often and notice their little things.
Well, in a nutshell, it's when two people are communicating in a playful way with each other, creating tension, energy, and excitement—and an important note is that it should be enjoyable for BOTH people. Unfortunately, we're not all natural born flirts.
Being engaged and interested in what your date has to say is a key part of flirting. Remember small details about their stories and bring them up later. They'll be flattered that you've remembered what they've said. If you're laughing together, it's usually a pretty solid sign your crush likes you.
Smiling at the other person, playing with your hair, and maintaining eye contact are great ways to flirt without physically touching them. If you do want to show your affection through a touch, try sitting close to them and giving a light touch on the arm or hand to start.
Sincere. This is the most common flirting style, and that's probably for the best. Sincere flirts are direct and honest in their interest, and they aim to build emotional connections from the beginning.
Jeffery Hall, an assistant professor of communication studies at the University of Kansas in Lawrence, and colleagues found five main styles of flirting: physical, traditional, polite, sincere, and playful.