One of the hardest decisions someone can make is what to invest in. For Daniel Purjes, there are numerous excellent strategies out there that someone could consider. They can follow the main story in the New York Times to see which businesses are likely to grow or not; they can copy the strategies of wealthy NYC and Rockwood investors such as Mctague and Barrons; they can look at the final list or report from Wall Street and see which asset or fund did the best in a certain period of time. Here, Purjes provides a number of key tips that…