I'm sorry if I'm ignorant of the platform, are the different posts the interview questions? Also what am I to make of the platform itself? Is this an app hosted

I'm sorry if I'm ignorant of the platform, are the different posts the interview questions? Also what am I to make of the platform itself? Is this an app hosted on heroku I can access later on my phone? If that's the case that would be awesome, like a targeted stackoverflow.