Scene view and Geometry view

[ISUther]

Hello, 

My name is Tanel. 
I am from Estonia. 
I started learning Houdini. 
Before i have used Adobe After Effects and a little Cinema 4D
I am in no professional user.
Here are some examples i have made used Adobe After Effects)and one project was done in Cinema 4D. 
Here are some examples of level where i want to get: 
https://vimeo.com/groups/xpchallenge/videos/133500158?ref=fb-share&1

https://vimeo.com/133562823

https://vimeo.com/132289126

https://www.youtube.com/watch?v=QOu1qjc9Twg

I am no near to that level. 
Here are some examples what i have created based on tutorials.

(Created in After Effects)
https://www.youtube.com/watch?v=bbp6ZHnIvKc
https://www.youtube.com/watch?v=uHe1lQEDkY4&feature=youtu.be
https://www.youtube.com/watch?v=BEATmdTvWtI&feature=youtu.be

And this is my latest (Created in cinema 4D): 
https://www.youtube.com/watch?v=jOby6S2KOvk

My goal is to learn and get to the level that i am able to do motion graphics like small commercials, design logos and animate them in 3d.

And then i discovered Houdini. 
I did see many Cinema 4d workshops on youtube also the "noseman" ones.
All were interesting. But when i piced up Houdini i discovered it is complex tool and before i start dooing advanced stuff i need to know the basics. I watched different tutorials that i was able to find on Youtube (some are good some are bad).
Why some are good and some are bad? 
Because some people explain stuff in tutorials and they speak too fast and you have to rewind back and listen what they say again and again and some people use shortcuts abut they do not explain how they opened some window. Or they do clicking and selecting so fast that you have to rewind and look video again to understand it. (For example some functions work only when you mouse cursor is hovered over that window or area).
But back to the question. 

Please can some one explain me nodes better.
There is Geometry view and Scene view.

I can create objects in Scene view and also in Geometry view 
In what cases should you create object in Geometry view and in what case should you create object in Scene view.

Please don`t hit me for having stupid questions. I realy want to understand and learn. 
I am too stubborn to quit.

Added additional attachments also.

In first picture you can see my view in the Scene level and on another picture you see Geometry level for the sphere

Goal atm was to make sphere move up and down, and smaller spheres follow the path for the biger sphere I went inside of geometry level for the sphere and created new sphere there and connected them but i cant see the animation for them in Scene level. In Scene level i see only the first sphere move up and down (animated that one in Scene level)
 

Is there a difference animating in geometry level or in Scene level?

[Neon Junkyard]

When you create a sphere at the scene level (I usually refer to it as object level), that is actually just a shelf tool that is making a generic geometry network, deleting the file node and creating a sphere inside it

If I am just doing regular sop work, 99.9% of the time I will create a regular geometry network, dive inside that and start working.

 

As far as animation, according to the docs- (https://www.sidefx.com/docs/houdini15.5/basics/objects)

Transforming objects vs. surfaces

Keep in mind that the normal unit of transformation (moving, rotating, and scaling) is the object. Transforming surfaces at the Geometry level (for example, using the Transform surface node) is more accurately deformation, and can potentially take much longer for Houdini to calculate than just transforming static object geometry at the scene level.

This is not to say that transforming at the geometry level is bad: often you need an object’s shape to deform over time. However, you should remember to look for opportunities to accomplish your goals by transforming objects before you look at transforming surfaces, because the former is more efficient.

 

So depending on what you are doing either could work for you.  I typically animate at the SOP level though as networks become increasingly complex, because you can do things like create dummy animation on a transform node, reference that animation elsewhere in the network, time offset it, add in deformers, etc etc.  I also find scene level animation to be cumbersome as then you start getting into pre-transformations and object merge issues and other things that can mess you up if you do not know what you are doing

That being said, scene level animation is good for things like parenting (creating camera and light rigs etc), attaching objects to motion paths, and other things. In the end though it largely comes down to personal preference

The docs are a really good place to start with stuff like this, I would start here

https://www.sidefx.com/docs/houdini15.5/basics/_index

Good luck!