If you use Photoshop on a regular basis, it saves a lot of time to know as many of the keyboard shortcuts as possible.
This is a short list of well-used commands in Photoshop where the shortcut can be very handy.
If you start using these 33 keyboard shortcuts, you will very soon get used to using them, and find yourself remembering them without having to refer to the sheet – then you can introduce others to memorise in the same way.
I have presented this table of shortcuts in the logical order you would want to use them when working in Photoshop.
This .pdf file also includes a short tutorial on how to customise the keyboard shortcuts for your own needs and preferences.