An iPad can serve as a second screen for a Mac via Sidecar, available since iPadOS 13, but Apple isn't the only manufacturer to support such a feature. Samsung has had a similar tool since One UI 3.1 that lets you turn certain Samsung Galaxy tablets into second displays for your PC — and there's a hidden feature that expands it to more tablets and even Samsung Galaxy smartphones.
You don't have to see every app installed on your phone if you don't want to. Samsung One UI makes it easy to hide apps from your Samsung Galaxy's home screen, app tray, and search tool, whether you want to declutter, simplify things, or keep other people from seeing some of the apps you use.
You've probably connected your Android device to dozens of Wi-Fi networks since you've had it, and your phone or tablet remembers each of them. Whether it's a hotspot at home, school, work, the gym, a coffee shop, a relative's apartment — or even from a friend's phone — each time you type in a Wi-Fi password, your Android device saves it for safekeeping and easy access later.