Question: I searched about anything and refered by dictionary like below in the first quote

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> anything : used to refer to a thing, no matter what.
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so I'm curious "take anything selected" is meaning that take everything no matter what is selected?

I read this below sentence in the second quote, and don't figure out meaning of it

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> Git takes anything selected and stages it for you
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I want to know the meaning of this second quote.

Answer: 
The person's personality would be described as [**malleable**](https://www.merriam-webster.com/dictionary/malleable):

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> [Merriam-Webster]  
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> **2 a** : capable of being altered or controlled by outside forces or influences
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Using it with the example sentence:

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> He is a *malleable* type of person.
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Or, more naturally:

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> He is weak-willed, and has a *malleable* personality that is easily influenced and changed by others.
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It doesn't fit your sentence well, but the person could be considered a ***chameleon*** ([M/W def 2](https://www.merriam-webster.com/dictionary/chameleon))

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> a person who often changes his or her beliefs or behavior in order to please others or to succeed
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By analogy to an actual chameleon, which changes coloration to match its surroundings.