Buying low is a trade strategy where you acquire a player whose fantasy value has recently fallen. Maybe he is in a slump, dealing with a minor injury, or his team is struggling. Because other managers are worried, his price is cheaper than it was a few weeks ago. If you believe the bad stretch is temporary, you can get a talented player at a discount.
The key to buying low is figuring out why the player is struggling. If the reasons are bad luck or a tough schedule, he might return to form soon, and you win the trade. If there is a real problem, like a new injury or a lost role on his team, the low price might still be too high. Smart managers look at targets, snaps, and usage to judge whether a player is truly playing worse or just producing less.
The opposite of buying low is selling high, where you trade away a player at his peak price. Many managers try to pair the two moves: sell an overachieving player and use the gained value to buy an underachieving one.