============== FlySoros 1] Yes,but long story short, its like asking a medical Dr how to make money in medicine. Yes... 2]Yes; study ALL the data you can find.Even if you do not trade/invest the DOW/DIA, go back 100+ years...... Bear markets & bull markets are not nearly the same; see 200day ma defines them ,nicely/with discretion Book of Proverbs[4000years old ]still helps; Jack Schwager top trader books are still helpful in ANY market.
Yes, trend could be thought of as correlation, or slope of a regression line. If the slope is nonzero, then you have a trend. But as for the last part of the OP's question, nobody can read the future.