Teams that look strong on paper can often perform much less impressively if even one or two key players are removed from the mix, and even the very best teams can look vulnerable with a long enough string of tough-luck injuries.
Travel fatigue refers to the cumulative physical and mental drain that comes from crossing time zones, sleeping in unfamiliar environments, and competing on compressed schedules. It is not just about being tired from a long flight.
Stacking refers to the practice of loading your lineup with multiple players from the same game or the same team. It is a widely used strategy, and most major DFS platforms allow it.