I have been using a Mac (Macbook) for years now and I must say Safari is by far the best browser for macOS, if you are looking for an easier way to quitting or closing the Safari Application you can do it by pressing Command ⌘ + Q keyboard buttons together!
Safari Application Quit/Close Keyboard shortcut: Command ⌘ + Q

Mac Safari Application Quit or Close Keyboard Shortcut
✏️ Command + Q is the standard way of closing any macOS application.

Safari Icon on the dock
If the Safari Application is pinned to the dock, the app icon will be visible there but the app open indicator (by a dot as you see in the above image) will disappear, when you open Safari again it will re-load again. On the contrary if you have de-selected the option to keep Safari in dock, you will see that as you quit the app using keyboard shortcut the icon promptly disappears from the dock as well.
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