https://github.com/nostr-protocol/nips/blob/master/38.md

Laser eyes are a Bitcoin maxi culture thing. It's like being "laser focused" or seeing the world through a Bitcoin lens (you denominate goods in sats)

Long form notes are replaceable kinds and clients should render markdown with them as well

https://github.com/nostr-protocol/nips/blob/master/23.md

As far as cost for videos. No. I mean there are probably media servers that charge for storage, but you can host your own content. Any video on nostr is just a link to a video that's hosted somewhere. Whether that be yourself or a service is up to you.