$1$ The Company Information page is where you can find:

Your org ID

Licenses available and in use

Information on important limits such as data and file usage

All of the above

$2$ What are the three main categories in the Setup menu?

Object Management, Preferences, Groups

User Management, Settings, Security

Administration, Platform Tools, Settings

AppExchange, Profiles, Customizations

$3$ What is an easy way to find what you're looking for in the Setup menu?