Obey to Referee & Line umpire
Rule 1: Obey Referee Decision. (The Line Umpire speaks only to the Main Referee )
Rule 2: If you have any questions or ambiguity and want to challenge the decision, follow Rule 1.
Additionally, if you hit an illegal shot, be sure to call it right away. A quick response to these situations is appreciated

Serve with Your Opponent in Mind
Before serving, be sure to wait until your opponent is ready for your shot. Discourteous players may attempt to score a point by serving when their opponent is unprepared — and that won’t earn you respect or friends on the badminton court.

Hand the Shuttle Back Politely
It’s customary to hand the shuttlecock back when it lands on your side of the court. Avoid picking it up with the head of your racket, as this can damage it. Instead, pick it up and hand it back politely to your opponent.
In some cases, you can use a light underhanded stroke to hit the shuttle back to your opponent’s side of the c

Keep Calm
It’s easy to get frustrated when you’re not playing your best. But no one wants to be the angry guy or girl throwing tantrums on the court. Every badminton player wants to play with someone who has fun — no matter what happens during a game.
With that in mind, do your best to stay calm during every game, even if you lose. No one wins every match, and that’s okay! Having fun and improving with practice are both more important than beating your opponent every time.