Privacy is important. Secret agents live very private lives. Be informed of what apps are accessing your location, your contacts, your camera, microphone, and more.
Go to Settings (System Preferences on a Mac) > Privacy and start exploring to see what apps have access to what.
If you don’t want an app to have access to a service, revoke it. You can also decide if an app needs access to a service when running in the background. A description will explain why the app asks for certain permissions.
When opening an app for the first time, pay attention to the pop-ups. You may be giving more permissions than you want to.