Remove a node: hold down the "A" key and click on the node

Snap to line: alt + shift + s for windows or option + shift + s for Mac

Undo: ctrl+z for Windows or cmd+z for Mac

Redo: ctrl+y for Windows or cmd+y for Mac

Delete: select feature click on delete for both Windows and Mac

Adjust feature: alt + shift + a for windows or option + shift + a for Mac
​Move feature: alt + shift + m for windows or option + shift + m for Mac
​Rotate feature: alt + shift + r for windows or option + shift + r for Mac

Disable modifications: alt + shift + n for windows or option + shift + n for Mac

Escape: Deselects a feature once selected or will stop a process such as drawing

Shift: Allows a multiselect or, if used in conjunction with drawing or splitting allows curved features.