The lever system is a very important part of your swing. Learn to get the club hinging and unhinging correctly.
Sitting on a chair and making swings is a great way to feel how yur arms work together.
The L To L drill is very helpful with showing you how the ninety degree angles in your swing work.
Being able to hinge the club is a very important part of the swing. Learn how to use the hinge drill to improve your swing.