You have master the use of your whip and gain following benefits.

• You gain proficiency with whips.
• When you take the Attack action and attack with a whip, you can use your bonus action to attempt to disarm or trip an opponent within your reach. The opponent must make a Strength saving throw. The DC = 8 + your proficiency bonus + your Strength or Dexterity modifier (your choice). If they fail they are disarm or proven. If you are successful,  you can't use your whip until your next turn.
• While you are wielding a whip, other creatures provoke an opportunity attack from you when they enter your reach.