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Professional Floor Traders and Big Money Managers, how do they trade & execute?

I am curious, I am assuming per all the info out there on the web, that the professional floor traders and big money managers at major firms like (GoldMan Sacks etc..) trade and execute trades based on major support/resistance levels, market profile levels, several fib levels.

Am I right on this? or wrong?

If so, then I would think it's smart to learn and trade like them? correct? Trade where the "smart money" trades?