hi nishant joy n everyone arduino is kind of new to me

i know just a little bit about it. i want to control my. ac fan. ohhh i live in India 220 volt 50 hz
i want to control its speed.

i have seen n read all the posts but i havent understood any of it. plz plz tell me what hardware and. what hardware device i have to learn about. plz nishant help me. any adive would be highly appriciated. ✌✌✌✌✌✌