What do you need when making an app? (in 5 minutes)

100%
1.My age is(Required.)
2.I am from(Required.)
3.I am:(Required.)
4.My app is in this stage:(Required.)
5.Choose 5 factors from this list that you think are important for app development.
Don't take more than 5 minutes to make your choice.
(Required.)
6.Please fill in the biggest problem you have faced while in the process of developing an app: