The quarterback is one of, if not the most, important positions on a fantasy football roster. In standard leagues, each team will have one quarterback slot, meaning making the right decision on who to start is vital to a team's success.
Depending on the number of teams in the league, it is common for every quarterback to be taken in the fantasy draft. In a 16-team league, every team will attempt to acquire a starter and a backup in the draft since there are only 32 starting quarterbacks in the NFL. If a league only has eight or ten teams, leagues are more likely to have quarterbacks available as free agents to pick up if needed for a bye week or better matchup.
In terms of draft position, quarterbacks are not usually the most coveted players, despite being the highest scoring. If you intend to add a top tier QB to your roster, their average draft pick position could be anywhere from 20-50, but there are always quality starters available even past the 10th round.
In standard scoring leagues, a quarterback will receive 1 point for every 25 yards thrown and 4 points per touchdown, however, they will lose 2 points for every interception. Their rushing scoring follows how skill position players earn points, at 1 point per 10 yards and 6 points per touchdown.
Quarterbacks are usually the highest scoring player on a fantasy team, and are less touchdown dependent as other positions.
There have been many fantastic performances in fantasy history, but the highest number of points scored by a quarterback in a single game was 61 by Michael Vick in a 2009 game for Philadelphia Eagles. His dual threat ability lead to 333 yards and 4 touchdowns through the air and 80 yards and two touchdowns on the ground.