What is Cinemachine & Timeline
Cinemachine is a powerful tool included with Unity. It allows you to manipulate cameras in Unity with ease. Character cameras, player cameras, enemy cameras, security cameras… Cinemachine takes care of all of that. Use Cinemachine to place and move cameras within Unity with ease.
Follow this link to learn more about Cinemachine: https://unity.com/unity/features/editor/art-and-design/cinemachine
Timeline is a non-linear editor (NLE) video system. With Timeline we can arrange events that are played back in a linear sequence. This allows us to easily set up video game elements and components to occur on a time line. Events in Unity can be used to trigger video playback from within Unity.
Follow this link to learn more about Timeline: