Powerspec G707 external SSD

Hello, so I just bought this Pc at MicroCenter and I'm really new to these things. Is there any way for me to add an external SSD to my desktop? If so, can you guys give me the links/articles/steps on how to do it?
If not, can I install Linux(Ubuntu) in the external hard drive and plug it in my desktop. (Any help will be helpful for me) 
Thank you.

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