The N.F.L. announced on Tuesday that as part of its stated commitment to “protecting players from unnecessary risk, while keeping the game fair, competitive and exciting,” it would implement new rules and emphasize others for the betterment of the game.

Chief among its priorities for the coming season: disciplining players for hits targeting an opponent’s head, a Covid-19-related relaxing of rules around how long injured players are ineligible and making sure that players do not tease each other too much.