On this page won't explain any concept, it'll only have “how-to.

On this how to make animation, it'll only have explain basic animation.

Create animation on animation list to edit it.

You can't move keyframe after you set it
You can't delete only one keyframe (you'll need to delete all parameter keyframe line)

You set parameter to make animation, set as you'd like.

It's better to set “same frame keyframe” on slightly different frame to animation look more neat.

Watch out to not press R or N
R erases all keyframes on the frame.
N set all keyframes on the frame.
It happens whenever you are on Animation mode

Play animation to check how animation is all together.
Add keyframe, or keyframe from start if something is off.
And check animation again.
Repeat it until you are satisfied.

Then go to next step.

Create camera, select size of video that you want to export and place camera on part you want to show.

Click on export video and select animation that you want to export.
You can change loop value if you want to repeat the animation on one video.
You can change others settings, but if you don't have any preferences, you should keep it as default.