Always keep in the game. Move into spaces le by your team-mates. When you are attacking and you lose possession of the ball, don't just wait to see what is going to happen. Fight to get your ball back from the opponent who tackled you, or at least harass him thus giving your side time to reorganize itself. The first line of a team's defense is its forward line.
Football is a team game.
No one is playing alone. Success depends on your whole team being a single unit. There are eleven players and also the reserves helping each other to fight for the same objective. Study the rules of the game. By being really familiar with the rules, you will get more out o a game, whether you are playing or watching it 5.