By default, the Publish page contains lots of options, spread across several tabs, some of which you will be unlikely to use for a given channel (such as the expiration date for an entry) and some of which you will intend to use, but will be liable to forget about (such as selecting the categories for an entry).
Luckily, as a Super Admin, you can customize the Publish page so that the workflow better suits your needs.
In the FAQs channel, you know you must select the category for a new entry, so instead of having the categories on a separate tab, you will move it to the bottom of the main tab so that you must scroll past it in order to submit your entry. In this way, you are less likely to forget to fill it in.
1. Log into the control panel as a Super Admin, and go to the Publish screen for the FAQs channel (Content | Publish | FAQs).
2. Towards the top-right (just to the left of the Notepad on the right-hand side), you should see an option that says show toolbar...