Default shortcuts (Mac) 

Cmd + k = Capture
Cmd + alt + k = Decrement capture counter
Cmd + alt + v = Hide/ Show viewer
Cmd + alt + r = rotate right
Cmd + alt + l = rotate left

A summarized list of CHOne Default shortcuts can be found in Capture One 10 > Edit keyboard shortcuts > Summarize 

Create your own shortcuts

Capture One CH allows you to create shortcuts for most functions. To customize your shortcuts, you first need to create your own shortcut list.
Capture One 10 > Edit Keyboard Shortcuts > Create
Name and save your shortcut list. It will appear in the drop down menu on the top left of the edit shortcuts window.
Select the function you would like to edit and add your shortcut. If the shortcut is already in use, a message will appear at the bottom of the page. You can choose a different shortcut or edit the preexisting one.