Rather than repeat an old/long post, here’s a link to an old comment showing the contents of my office.
Although the chair is not shown in those photos, it is an Ikea Järvfjället. Much more expensive than I wanted to spend on a chair, but it is very nice. I adjust its height and tilt all the time, but I’m always seated in it when working.
One important thing is that my keyboards are generally on a shelf lower than the desk surface and I use a wrist-rest to tilt the keyboard backward (that is, where the top row is lower than the spacebar). That helps reduce stress on the wrists when doing a lot of typing.
And never actually rest your wrists on anything while typing. Keep them up so your hands are angled down. Only rest your wrists when you’re not actually typing.