How much data should I get for an iPhone 5s?

I want to start a plan with AT&T and its asking how much shared data I want and I don't know which one to choose. To be completely honest I don't even know what shared data even means. I googled it and some people say its like the internet usage but i'm not completely sure. I used to have be in a family plan on sprint with my uncle and I didn't even know how much shared data we had.

I'm always connected to my Wi-Fi when I use my phone at home and I'm at home almost all day. When I'm at home, I'm always browsing my feeds on instagram, facebook, twitter, checking my emails, etc. I don't use my phone a lot when I'm out of the house, I only use it to google things. Sometimes I'll go on instagram, etc or i'll check my emails when I'm in the waiting room for an appointment or something. Btw, I'm starting this plan with my two sisters. How much data should we get?

Iphone dropped in toilet

Alrite so i dropped my iphone5c in the toilet took it out really quick n not That much got in it n i dried it up And everything n i read that rice will help but i don't have any right now so i'm wondering what i should do?

Iphone (problems after jailbreaking)?

So I jailbroken my phone add any time i try to type something in, in a app that app messes up and I go back to the home screen but I can type in safari and any app I have in my iphone. I just jailbroken my phone and whenever I put my phone in safe mode none off my apps cancel out what should I do?!

IPhone 5 app that downloads YouTube videos for music?

On my old android phone, you could get an app where you download YouTube videos and save then I'm your music to listen anywhere. I know there are some apps like that for iphone but I've looked? I just want to download YouTube videos and be able to listen to them in no Wi-Fi like normal music. All the mp3 downloader apps never have the right songs, just covers