Mac users who only need a simple video editor will find that Apple iMovie is the best free video editing software, because of its strong integration with Apple's operating system and easy-to-grasp editing tools. iMovie supports 4K video, and has some good tools for smoothing shaky video, adding titles, and even soundtracks from music in your iTunes library.
However, you won't get advanced features such as 360-degree video editing and special effects here.