you need a tripod if you’re planning on getting tack sharp images.
A disclaimer or two. Frequently I use a tripod to get shots that are not tack sharp. And, you don’t need a tripod to get tack sharp shots, but you do need to understand what you are attempting and a good grip helps.
If you are shooting a stationary object, a tripod can easily get you a sharp shot. If your subject is moving you may not get a sharp shot with a tripod. When doing something like lens focus adjustment, a tripod can be a big help.