Tap and hold or just drag the app from the App Library App Library > long press the app > tap Add to Home Screen. You can also search for apps from the App Library and add them to your home screen ...
You can organize apps on your iPhone by moving them around, putting them into folders, and sending them to the App Library.
You might not know about all of these iOS settings, but they let you tweak your experience and get the most out of your iPhone.