I’ve already written here on The Sweet Setup on why I’ve settled on Craft as my app of choice for preserving knowledge. Though there are other apps (Roam Research, in particular) that would likely provide superior and more efficient means at finding information, Craft provides a few other features that make it my app of choice.
First, as of the time of writing, Craft’s harnessing of the Apple Pencil as a strong input tool catapult it to the top of my list. I try to handwrite as much as possible — I tend to remember things I’ve written down at least twice as much as if I’ve typed them. Craft’s block-based format and drawing blocks are ideal for this study method.