Hi OPKhadka. Deleting apps works the same as it did under previous iOS versions. There are 2 ways:
– Tap (lightly) and hold an icon until the icons shake. Tap the ✖ next to an icon to uninstall the app.
– Open Settings > General > iPhone Storage. Wait for the list to populate. Tap on an app in the list to get the Delete option.
Make sure you don't have Restrictions preventing this, Settings > General > Restrictions.