I randomly got tipped 2$ in btc. Can someone tell me exactly what this?

A few days ago someone randomly tipped me 2$ through chaintip. I read some posts about it and it's apparently some kind of tipping app where you can tip users through comments?

I'm not very familiar with crypto currency stuff so can someone tell me what I can do with this.

So I need to download an app to claim it, do I need to give any of my personnel information? Like my credit card numbers and stuff to claim this?

Can I convert this to real money? Can I use btc to buy stuff? Also why would someone randomly send money? I didn't post anything, this just randomly sent to my pms.

Are there any risks, like if I need to send them my wallet address to claim it, will it include any personnel info?