Never forget that fantasy football changes on a weekly basis.
Don't throw out months of research and analysis based on a single-game sample. Don't discard an early draft pick because he didn't meet your Week 1 expectations. Also, don't assume the Week 1 sleeper who hit big (looking at you, Russell Gage, and your nine receptions for 114 yards) is suddenly the NFL's next breakout star.
Matchups matter. Opportunities matter. Injuries change things in an instant. And let's not forget the randomness that makes fantasy football so exhilarating or frustrating—depending on which side of the scoreboard you land.