A list of general keyboard shortcuts are available from JMP in HELP>BOOKS and also here: Keyboard Shortcuts and Menu Descriptions
JMP is very context sensitive, and each graph has different options associated with the type of data and statistics displayed. In general, right clicking on an axis or graph or legend gives you options. And of course the red triangle, when available, gives options.
Some platforms have their own keyboard shortcuts. You can look them up from JMP>HELP>SEARCH or from the online documentation at www.jmp.com/help. When using jmp.com/help, remember to use the search box on the page, not on the top of the page. The box on the page searches ONLY documentation, rather than all of jmp.com.
While you are in a platform, the ? tool hovered over a graph or statistic will open HELP and that is also a way to see if there are any keyboard shortcuts for that platform.
For example, see http://www.jmp.com/support/help/Keyboard_Shortcuts_2.shtml or for Surface Plot Keyboard Shortcuts http://www.jmp.com/support/help/Keyboard_Shortcuts_2.shtml#1026363