The menu bar belongs to the app, not the window
On a Mac the menus live at the top of the screen and always belong to whichever app you are using.
Works on: macOS Ventura 13 and later · checked on macOS Golden Gate 27
Published: · Source: Genius Manu
The single biggest change coming from Windows: menus are not inside the window. They sit in the strip across the top of the screen, and they always belong to the frontmost app. Click a different window and the whole bar changes with it.
The layout repeats from app to app: the app’s own name in bold first, then menus with standard names such as File, Edit, Format or Window, and every app has a Help menu. If you cannot find a command, those are the first places to look.
On the far left, the Apple menu is system-wide rather than app-specific. It is where About This Mac, System Settings, Sleep, Restart and Log Out live, and it never changes no matter which app is in front.
The right-hand end is the status area: Wi-Fi, battery, Control Centre, the clock, and an icon for any app that asks for one.
Related tips
Put the controls you use most in the menu bar
Bluetooth, AirDrop and the rest can sit permanently at the top right instead of two clicks deep.
Closing a window does not quit the app
The red dot leaves the app running. Command-Q is what actually closes it, and the Dock tells you which is which.
Force quit an app that has stopped responding
The Mac equivalent of Ctrl+Alt+Delete for a single frozen app.