What are you supposed to do when someone subscribes to your videos on youtube ?

Well, having a subscriber means someone likes your videos and would like to keep up with them.

When someone subscribes to ME, I send them a message telling them I appreciate the subscription.

I never tell people to subscribe. If they like the videos, they can subscribe if they want. So when I get one, I know it's a compliment that they like my videos... and it's not a FORCED subscription (for example, "omg subscribe to me!!!!" or "I'll subscribe to you if you subscribe to me.").

So I would just say, "Hey thanks for the subscription." Maybe they'll message back telling you what they like about your videos. It's nice to interact. =)

Be happy, be really, really happy. Most people struggle for ages trying to get even 1.

A subscriber is just a person who likes the videos that you make, and will be notified when you make new videos, by having them displayed in their main page.

Keep doing, what you're doing, cause you're videos are already attracting viewers. Congrats!!

accept if u want and ignore if u don't