This is what troubles me about learning categorization. I (most of us) learn things by trial and error. For me, it is sometimes systematic trial and error to see what works. I'm reluctant to try because of the trail of mistakes left behind. I understand there is a policy for not deleting stuff (profiles, categories, etc.) but it is intimidating. As I go through categories and links I see things that look like tests or mistakes and a lot that I wonder if it is legitimate (or useful, shall I say?). The clutter is hard to navigate.