[JayBee1404]

Don’t start with the assumption that you must use a strap, or that you must assume the ‘classical’ posture. Plenty of players don’t use a strap when seated, nor do they play in the ‘classical’ position. Do what you are most comfortable with.

I play seated 90-95% of the time nowadays. I only use a strap for the remaining 5-10% when I play standing. Never found any need for a strap when seated, nor for the ‘classical’ position (which I find excruciating, and my arm and shoulder start to ache within a few minutes of beginning playing) - guitar resting on my right thigh (I’m a ‘righty’) works perfectly for me, comfortable and puts my left arm and hand in a perfect, stressless position.

But, as I said at the top, the important thing is to experiment, and do whatever works best, and feels right for you.

The usual disclaimers apply......IMHO, YMMV etc.