This is all a part of learning how to be flex able with your rifle. You will use these rifle positions all the time when moving with your rifle. Good to know each one and feel generally comfortable with each one.
In this lesson, Garret Breaks down the difference between target focus and sight focus. There is a lot of debate on which is used when, hopefully, this will help shooters have a better understanding of them.
Here Garret shows a holster draw standard for you to practice on your next range day.
How to Appendix Carry