Where to find a printable list of Mac and iPad Keyboard Shortcuts

Here’s they are for MacOS and iPadOS

While neither are “printable” you can easily C&P them into your own document for printing.

This process might also help you winnow-down the list to a single-page.

Mac keyboard shortcuts - Apple Support

Learn iPad keyboard shortcuts - Apple Support

Here’s one site, but an internet search will turn up many more.

https://macmost.com/category/keyboard-shortcut-pdfs

I used the title of your post as the search term (Safari using Duck Duck Go).

There’s vastly more than one page of menu shortcuts available, assuming a legible font size.

Might be easier: the shortcuts in the current context are usually shown to the right of those menu entries that have shortcuts: What are those symbols shown in menus on Mac? - Apple Support

A partial list: Mac keyboard shortcuts - Apple Support

The recommended list of shortcuts (this article is intended for app developers, but describes how this keyboard shortcuts stuff is all supposed to usually work): Keyboards | Apple Developer Documentation

The iPad User Guide may be a useful reference for available key-shortcuts - these only being available when using an external physical keyboard, such as the Apple Magic Keyboard:

Use shortcuts on an Apple external keyboard with iPad - Apple Support

Also be aware that when using the iPad in Windowed Apps or Stage Manager multitasking modes, you can access context-relevant menus (that show the equivalent key-shortcuts) from the new top-menu bar. Simply tap the window name at top-left of the iPad screen to expose the top menu, then open the associated menu to see a menu items along with their equivalent keyboard shortcuts.