Question Where Are The Best Hands on Tutorials With Exercises About Creating Cinematics?

I agree with neoshaman, studioBinder is great. For example, have a look at this video by them, where they sometimes show an abstract view of the camera positions, which makes it very clear. You can manually convert those to Cinemachine. If you'd like a great intro book, then I'd recommend "Film Directing Shot by Shot" by Steven D. Katz.

A good idea would be to look at real life scenarios or movies and take notes.

If you'd like to a do cutscene, you could combine Cinemachine and Timeline.

If you'd like to do a dynamic shot of an ongoing fight scene, then you could do a sequence like this:

1. Dolly Camera (Dolly Camera with track). Here you could do a circle around your fight ring. For example: create a vcam that follows the dolly cart and looks at the middle of the ring.
2. Close up shot of fighter A in corner A.
3. Close up shot of fighter B in corner B.
   
4. Fight start, camera goes to the side with a target group. The target group holds both fighters, making sure they are always in the shot.
5. If you know when a some events happen, then you can change virtual cameras to them when that happens. E.g. You know a knock out is happening or is about to happen, so you cut to your knock out virtual camera, that you specially fabricated for this purpose.

I am a newbie, so take my advice with caution

 

I agree with @gaborkb, the Unity Timeline with a (or multiple) Cinemachine tracks is your best bet.
With your editorial content in mind, you can simply add one Cinemachine Virtual Camera 'per shot' or 'cut' and use the multiple tools from Cinemachine to help you (Dolly track, LookAt, Follow). You can mix between Virtual camera as well.
A bit like this:



Of course, each individual Cinemachine VCam have its own set of component and parameters.

Hope this help, let me know if you have any questions.