DESKTOP
App shortcuts on the main page
Open the apps page (the circle of dots), then click-and-hold an app and drag it onto the home screen. To remove one, click-and-hold it and drop it on the word Remove at the top. It stays available from the apps page.
SAFETY
Don't delete apps you don't recognise
Some apps are there for diagnostics, antivirus or core system functions. Don't uninstall an app just because you don't know what it is. If in doubt, ask support first.