How do people express gratitude?

Insecure2

Today is my birthday and the first person WHO gave me a present (a box of chocolates) and wished me Happy Birthday was my instructor. When we finished the lesson and were saying 'goodbye' I gave him a kiss on the cheek as a form of 'thank you'. How do you thank people for a sweet gesture?

How do people express gratitude?
How do people express gratitude?
3 Opinion