The 2020 Census is very brief. It will only ask you some basic questions: your name, where you live, your phone number, the number of people living with you, your age, birthdate, sex, and race & origin.
If you're not sure whether to count your roommates* or whether to be counted at your parents' residence, please watch the official 2020 Census video for college students on this page.
* It's better to be temporarily over-counted than not to be counted at all!
"In general, students in colleges and universities temporarily closed due to the COVID-19 virus will still be counted as part of this process. Even if they are home* on census day, April 1, they should be counted according to the residence criteria which states they should be counted where they live and sleep most of the time..." (Census press release regarding counting college students, March 15, 2020)
* Since students would normally be at school on April 1, this means that they should mark themselves at their college address even if they are staying with their parents during this time. This applies mostly to those living off campus (dorms and Greek houses will normally take care of the Census form for students).