Taking better product photos
You don't need real equipment for this - a phone camera and a window are enough for almost everything below. What actually matters is light and background, not gear.
Use natural light, not your overhead light
Shoot near a window during the day instead of under a ceiling light at night. Indoor bulbs cast a yellow tint that makes photos look duller and less accurate than they should - daylight is free and always looks better.
Keep the background plain
A clean wall, a plain sheet, or a wood table beats a busy room every time. The item should be the only thing pulling the eye - clutter behind it reads as unprofessional even if the item itself is great.
Fill the frame
Get closer than feels natural. A photo where the item takes up most of the frame looks far more considered than one with a lot of empty space around it.
Show scale
For anything where size isn't obvious, one photo next to a common object (a hand, a coffee cup) saves you from the single most common buyer question: "how big is this actually?"
Include one photo of it in use
A mug being held, a scarf being worn, a finished project from a service you offer - one "in context" shot alongside your clean product shots does more to build trust than five more studio angles.
Multiple photos, multiple angles
Front, back, a detail close-up, and anything relevant to what makes it worth the price (stitching, texture, a signature). Listings with more than one photo consistently get more serious interest than single-photo ones.