See how your profile looks to other people
Curious what exactly strangers see when they stumble across your profile? Go to your profile page on a computer and select "View As" from the button with three dots at the top right. This gives you the option to see what part of your profile is visible to the public, as well as to specific individuals.
Control who's seeing your stuff on a case-by-case basis
If you'd prefer to restrict your audience for a particular status update, photo, or video post, it's easy. Click the menu at the top of the post and you'll notice the option to select between Public, Friends, Only Me, or a custom group. And while we're at it, it's worth mentioning that if there's a particular status/photo/video/etc. you want to deploy without it posting to your timeline, select "Hide From Timeline" from its drop-down menu.