What do the B, C, G, M, R, and W shortcuts do in Nuke?
Each letter drops a specific node into the Node Graph at the current position: B inserts Blur, C inserts ColorCorrect, G inserts Grade, M inserts Merge, R inserts Read, and W inserts Write. Holding Shift while pressing one of these keys creates the node in a new branch instead of inline; holding Ctrl (Cmd on Mac) replaces the currently selected node with the new one.
Are Nuke's keyboard shortcuts the same on Windows and Mac?
Almost entirely. Nuke's own documentation says to replace Ctrl with Cmd on Mac, every other key, including Shift combinations and the mouse-button gestures, stays the same.
What does the X key do in Nuke's Node Graph?
X switches the Node Graph into command entry mode, letting you type a Python or TCL command directly instead of using the mouse or menus.
How do J, K, and L work in Nuke's Viewer?
J plays the Viewer backward, K pauses playback, and L plays forward. This is the same three-key convention used by most professional editorial and color-grading tools, so the muscle memory carries over.