How to properly engage in physical contact with a girl on a date?

Common physical contact routines: 1. When you squeeze into a bus or subway together, consciously get closer to her and help her when the vehicle shakes (ordinary friends stage) 2. When you encounter an obstacle on the road, such as a small puddle, you can hold her hand and let her stride over it (ordinary friends stage) 3. When crossing the road, naturally hold her hand to give her a sense of protection, and remember to let go of her hand after crossing the road (ordinary friends stage) 4. When sitting with her, touch her hair. If she asks you, joke that there is a small bug in her hair (ordinary friends stage) 5. Smell her hair and say: Did you just wash your hair? Or use Head & Shoulders? (Ordinary friends stage) 6. Play games with her. If she loses, gently flick her forehead (ambiguous or boyfriend-girlfriend stage) 7. If she plays any pranks, tickle her armpits to punish her (ambiguous or boyfriend-girlfriend stage) 8. Pretend to lie down and talk in her ear and blow a breath in her ear (ambiguous or boyfriend-girlfriend stage). . . Finally, let me tell you when you can hold hands and when you can kiss: If you are walking on the road together, and you deliberately touch her shoulder with your shoulder, if she does not walk away, it means she is willing to let you hold hands. If you are sitting together and chatting, and you gently touch her hair with your hand, if she does not avoid it, it means she is ready for you to kiss her.