It's a menu command; ⌘O for Open, or ⌘+DownArrow for Navigate Into (as opposed to ⌘+UpArrow for Navigate Out/Enclosing Folder). You can search for menu commands in any app's Help menu (try it!)
Other than "That's how it works in Windows so it should be like that in every OS" people don't really give a reason for WHY Enter should be used for launching apps and files from a file manager. To me using Enter to enter text editing (rename) feels more intuitive and personally, I appreciate that you cannot accidentally start processes with a single keypress.
As for modifying favorites, drag items into the Sidebar. How is that not intuitive? Common locations are in the Go menu.
"Delete Immediately" is Alt+Option+Backspace, which shows up when searching for "Delete" in the Help search box, but again, when working in the GUI the Trash is supposed to remain a default safeguard against accidental deletion.
You can change most shortcuts for any app from System Preferences -> Keyboard.
Other than "That's how it works in Windows so it should be like that in every OS" people don't really give a reason for WHY Enter should be used for launching apps and files from a file manager. To me using Enter to enter text editing (rename) feels more intuitive and personally, I appreciate that you cannot accidentally start processes with a single keypress.
As for modifying favorites, drag items into the Sidebar. How is that not intuitive? Common locations are in the Go menu.
"Delete Immediately" is Alt+Option+Backspace, which shows up when searching for "Delete" in the Help search box, but again, when working in the GUI the Trash is supposed to remain a default safeguard against accidental deletion.
You can change most shortcuts for any app from System Preferences -> Keyboard.