Data is the cornerstone of any brilliant strategy. When you gather historical trading data, you're setting the stage for insightful analysis. Imagine trying to find your way without a map; that's what making decisions without data is like! Start by identifying reliable sources that offer ample coverage. Consider how fresh your data isâis there a lag? What's the data format like? These nuances influence your future calculations. Potential hiccup? Missing entries. Remedy? Cross-reference with other datasets. Equip yourself with a reliable internet connection and data extraction tools. Remember, a good craftsman never blames his tools!