Final answer:
Keyboard shortcuts are essential for efficiency in video editing, with specific commands for trimming edits and other tasks accessible through the 'Tools' menu and 'General Controls' sub-menu.
Step-by-step explanation:
The keyboard shortcuts for selecting which side of an edit to trim are involved with video editing software. While specific shortcuts can vary depending on the software being used, generally, keyboard shortcuts are used for efficiency in editing processes such as trimming. To use the command line for specific changes, you can bring up the command line by going to the "Tools" menu, selecting the "General Controls" sub-menu, and entering commands such as del : and focus. The command del :.b is used to delete backward from the cursor position, and focus is a command used to set the focus to a specific control in the user interface. Knowing and using keyboard shortcuts can greatly enhance the editing workflow and increase productivity.