The most important thing to be a best man is to observe and look into his eyes. For example, some help the groom open the car door and pick up the items in the groom's hand. Pass water when the couple are thirsty, and pass paper towels when they are moved to tears. Remember to remind the groom to pay attention to rest and hunger. When picking up the bride, the bridesmaid made things difficult for her. The best man should be the first to rush up and "shelter from the wind and rain" for the groom and remove all obstacles.
As the best man, you need to keep the couple's red envelopes. Some grooms take red envelopes from guests and give them to the best man. The best man should remember to give them to the treasurer or the couple's parents before the wedding ceremony and ask them to keep them. When toasting at the dinner table, the best man should help the groom stop drinking and can replace the bartender if necessary.