How do I delete apps on my phone

Delete [third party] apps on your iPhone, iPad, and iPod touch - https://support.apple.com/HT207618

Delete [and restore] built-in Apple apps on your iOS 12, iOS 13, or iPadOS device or Apple Watch - https://support.apple.com/HT208094 - "When you delete a built-in app from your device, you also delete any related user data and configuration files."

Delete built-in Apple apps from the Home screen on your iOS 14 or iPadOS device or Apple Watch - https://support.apple.com/HT211833

If you cannot delete an iOS app:

Go to Settings->Screen Time ->Content & Privacy Restrictions -> iTunes & App store purchases -> Deleting Apps, and make sure its set to allow

From: https://support.apple.com/HT201304#prevent-purchases

Hi , press and hold the app icon, in the drop down menu select remove app, then select delete app.