1.1 Keyframes

i helps you create keyframes that allow you to create animations.
While clicking i make sure to keep your mouse cursor in the Viewport

1.2 Playback Controls

These controls allows you during playing your animation.
Jump to start or end of timeline, Jump to keyframes,
play forward or reverse etc.

1.3 Different ways to create keyframes

There are lots of ways to create keyframes in blender software.
Its like the more you know, the more you grow