Basic $5 gig ideal for editing a single section and proofreading.
That gig is a basic service, it covers a single-section editing. It's ideal for clients who just want a new summary.
Yes. You can purchase gig extras according to your needs. There are extras that include "login and change" as well as "full profile editing" that includes the editing of all sections as well as small details such as your profile picture, background image and headlines.
No. Every person is different, I always try to capture the personality of my clients and use it to write the content for their profiles. Depending on the circumstances and the goals of each client I will also change the style, I can't use the same style for an entrepreneur and a venture capitalist.