How can I sit best to make my posture really great?
user
Well, I would recommend keeping your spine in a nice straight line, and then keeping your head in line with your spine.  How is this so far?
assistant
How can I sit best to make my posture really great?
user
Are you looking to align your head, neck, back, and pelvis to the best possible position?  What you’re calling “best possible position” is pretty open-ended, but it probably means you want to be as much in balance as possible.
assistant
How can I sit best to make my posture really great?