if you want to be a great adc main you must know how to think of your tactics

Step 1: Secure your position
You must always be behind the minions or your support

Step 2: Secure your minion
Your Enemy Adc Should Not Be Killed By Your Minions For Just A Little Gold He Can Get

Step 3: Secure Your Turret
When You Recall Your Support You Must Be There In Your Tower When You Cs Alone You Can Be Killed By Enemy Adc And His Support

You must always be with Allies or your support and you must always be behind your team because they always put the enemies first to kill the adc or Marksman because it is always a free hit so your team must be behind you so they can have a backup when just a little bit of their health