What are the operating systems of Apple ( mac ) and what i chose

hi..

Q1 -- Current operating systems for Apple and supported until now :
- mac os x snow leopard ( now stop update )
- OS X Mountain Lion ( Are there two versions: Lion and Mountain Lion )
- OS X Yosemite
- OS X El Capitan
I need a simple explanation and clarification of the types of systems , what is the best and newest .

Q2 -- I use ( mac pro - mac OS X 10.6.8 ) , After that i try to upgrade the system
But it shows me ( you have the last update ) why ? shuld I upgrade to another system ? any way To continue to use it and ubdate ?

َQ3 -- For any system should i upgrade ( OS X Mountain Lion or OS X yosemite or OS X El Capitan)

I need a simple explanation .

Thanks

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