How to run addtional Shells on top of the default shell

Hi

[LEFT][/LEFT]
What is the command to run additional available shells on top of default shell. I am using bash

also how can i tell that the additional shells are actually running?

Also what is the advantage of running additional shells on top of your default login shell of bash?

Lastly How can I terminate the shells I opened What would happens if i accidentally closed the default login shell?

Thanks

Bill thompson

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