Clear your mind and clear your direction. There are many divisions of labor in the film and television industry, including editing, color matching, soundtrack, packaging, special effects and so on.
Specific to learning, it is theory+practice. There are two ways to learn theory: books and movies. With a certain theoretical foundation, we can start actual combat. Hardcut one or two directly, and basically mastered the operation of the software. Before cutting, I know a little about editing software interface and menu. Check and memorize some commonly used shortcut menus, which will be more efficient to edit. With more post-editing, you will become more and more proficient in the operation of editing software.