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Guides on tidying up the macOS menu bar.
Two products are called Bartender: which one you are looking for
Searching for bartender software for mac returns two unrelated products: a Windows label and barcode suite, and a macOS menu bar manager. Which is which.
Build a menu bar app for macOS: the parts you need
A macOS menu bar app needs five parts: MenuBarExtra or NSStatusItem, no Dock icon, a login item, a notarized build, and a plan for when the icon is hidden.
A calendar in the Mac menu bar: the options and what each shows
macOS has no menu bar calendar; the clock shows only the date. Five apps add one: free Menu Bar Calendar and Itsycal, then Calendr, Dato and Fantastical.
Why the Mac menu bar sits at the top, and whether it can move
The mac top menu bar cannot be moved down or sideways on a screen. What can be changed: which display holds it, when it hides, and what it contains.
Show CPU usage in the Mac menu bar
macOS cannot show CPU usage in the menu bar on its own. Free Stats adds it; iStat Menus and Activity Bar are paid. Setup, and why the icon may not appear.
Google Calendar in the Mac menu bar: the routes that work
Google Calendar reaches the Mac menu bar in two steps: add the account to Apple's Calendar app, then install a menu bar app such as Itsycal or Fantastical.
Reach the hidden icons in the macOS menu bar
OS X menu bar icons, explained for current macOS: add, remove and reorder them, find the ones the notch hides, and the setting that switches app icons off.
Add an app icon to the Mac menu bar
How to add an app to the Mac menu bar: the Menu Bar pane, Control Center pins, the app's own setting, and a helper app when none of those exist.