Deal information - add a store name, amount (will be automatically changed when you add products to a deal), phase / stage (can be easily changed through a colored top panel), end date. You can also attach a deal to a contact or company - by clicking "Select" you will attach it to an existing contact or company, or select "Create" to add a new contact / company.
More - this section contains "Available to everyone" (Important! - may affect access rights), responsible person, comments, and so on. You can also add custom fields using "Add":