Permissions in Android apps should be granted based on their relevance to the app's primary function. Users should be cautious with permissions such as location, contacts, SMS, microphone, camera, and accessibility access, as they can expose sensitive information or control device capabilities. To review app permissions, users can navigate to Settings, select Apps, choose the application, and tap on Permissions. The Permission Manager under Security & Privacy allows users to see which apps have access to specific permissions. Android can automatically pause activity for seldom-used apps, removing previously granted permissions. If an app repeatedly requests denied permissions, users should evaluate the necessity of the request and consider maintaining their denial if it seems unwarranted.