The Top Bar supports the things you need to do no matter what space or page your in. EG: search, create pages, access your profile.

More useful things you can do from the Top Bar:

Logo

• The Logo (top left) will take your to the home space 

Spaces

• View and create spaces. Click Spaces to visit the space directory, where you can view all spaces on your site and create new spaces.

People

• Search for people on your site. Click People to visit the people directory.

Create

• Create pages. Click Create to create a blank page or the three dots to select a style/type of page

Question  Mark

• The question mark! Provides useful links such as: Online help (Confluence Help), Configure your keyboard short cuts and Some general information about your site.

Settings Cog

• The top bar is also where you go to administer Confluence, if that's your role. Click Settings (or the cog icon) to configure Confluence and any add-ons. If you're a site admin, click Site admin to manage users and groups.

Eigen Logo on the far right Is where you:

• View your profile
• Settings
• Recently view
• Add personal space
• And much more just click on the icon and have a look around