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: 
I prefer **impressionable**, as suggested by @KarimTabet, but I will add **gullible** and **credulous** to the possibilities he suggested. From Lexico:

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> **[gullible](https://www.lexico.com/definition/gullible)**: Easily persuaded to believe something; credulous.
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> **[credulous](https://www.lexico.com/definition/credulous)**: Having or showing too great a readiness to believe things.
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"Someone whose personality or character changes a lot and get [sic] more affected than others by company or influential people" is more **impressionable**, gullible\*\*, or credulous\*\* than others.
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.