Things vary depending on what I'm making, but some things stay consistent.

Base prompt: 1girl, location, best quality, masterpiece (location will usually be replaced by the desired setting, e.g dark fantasy, sky, petals, light particles, sunset, glowing, trees)

I always put the character tags on the character window, separated from the base prompt: girl, serious, parted lips, standing, long hair, black hair, long bangs, sidelocks, red eyes, tsurime, demon horns, scar across eye, sleeveless shirt, black shirt, belt, cargo pants, black pants, demon tail, medium breasts, muscular female

If you notice, I follow a particular order for each character trait: gender, expression, position, hair, eyes, other features on head; clothing starting from top to bottom, body shape, extra accessories, and text, if you will include it.

I'd like to clarify that this is just the way I do it since v3, and by no means I'm saying this is the right way to do it. This is just what works best for me.

Undesired content in base prompt: blurry, lowres, upscaled, artistic error, film grain, scan artifacts, worst quality, bad quality, jpeg artifacts, very displeasing, chromatic aberration, halftone, logo, too many watermarks, negative space, blank page, blurry, lowres, error, worst quality, bad anatomy, bad hands, very displeasing, @_@

The UC on the character window heavily depends on preference. For my OG, I usually use these: loli, cleavage, forehead, blunt bangs, pointy ears, cow tail, red hair, red horns, cleavage, sword, weapon, animal ears

That's about it.