In regards to using a redshirt year, many student-athletes are confused on how many games/competitions you can participate in without using a season of competition.
Per NCAA Bylaw 126.96.36.199 any competition, regardless of time, during a season shall be counted as a season of competition in that sport, except for the following provisions:
Bylaw 188.8.131.52.2 Exception-Nonchampionship Segment Competition-Women's Soccer and Women's Volleyball
In women's soccer and women's volleyball, a student-athlete may engage in outside competition during the non-championship segment only without using a season of competition, provided the student-athlete was academically eligible during the segment that concludes with the NCAA championship.
Bylaw 184.108.40.206.3 Preseason Exhibitions/Preseason Practice Scrimmages During Initial Year
During a student-athlete's initial year of enrollment, he or she may compete in preseason exhibition contests and preseason practice scrimmages without counting such competition as a season of competition.
Bylaw 220.127.116.11.4 Alumni Game, Fundraising Activity or Celebrity Sports Activity
A student-athlete may engage in outside competition in either one alumni game, one fundraising activity or one celebrity sports activity during a season without counting such competition as a season of competition, provided the event is exempted from the maximum number of contests or dates of competition.