What is the keyboard shortcut for marking an in-point in a timeline?

Marking an in-point in a timeline is an essential function in video editing software, allowing editors to define the starting point of a clip or sequence they wish to work with. The correct keyboard shortcut for marking an in-point is represented by the letter "I." This shortcut allows users to quickly establish where they want the editing to begin without navigating through menus, enhancing efficiency and workflow.

In many editing applications, each assigned keyboard shortcut corresponds to specific and frequently used functions. The letter "I" is closely associated with the term "in-point," making it intuitive for users to remember. This convention is widely adopted across various editing platforms, serving as a standard practice for video editors.

Other choices, while they may represent different functions in editing software, do not relate to marking an in-point. For example, "O" typically marks an out-point, defining where a clip ends, while "M" and "R" could represent entirely different commands that do not relate directly to the marking of in-points. Understanding these associations can help users navigate their software more effectively and improve their overall editing skills.