Student or Learner
The foreign person I admire most1.The reason why I chose Warren Buffet is that first, economy is one of the social concepts that we have to learn, know well, and use well.
2. The reason why I chose Warren Buffet is that first, economy is one of the social concepts that we have to learn, be well aware of, and make good use of.
Which version is better? Does 2 sound more like English?
They are both too cluttered, too busy.
You can make the beginning more clear and concise, too:
- I chose Warren Buffet because. . . .
- I admire Warren Buffet the most because. . . .
They both sound like English. You used the words "well" and "good" correctly, but they not needed in either sentence. There is no reason to know or use economics poorly, so "well" and "good" already understood.
There's also no need for "one of the."
"Social concept" is too vague. It would be clearer to just say "concept."
Finally, if we learn something, then we know it and are aware of it. So there's no need to put "learn" together with "know" or "be aware of."
So you can de-clutter the sentences this way:
1. I chose Warren Buffet because economics is a concept we have to learn and use.
2. I admire Warren Buffet because economics is a concept we have to learn and use.
I'm not a teacher. I speak American English. I've tutored writing at the University of Southern Maine and have done a good deal of copy editing and writing, occasionally for publication.