Router bits - Illustrations like this are easily accessible in your shop reference binder (every shop needs at least one!). Other ideas for binders: project plans, stain charts, glues and how to select the right one, paint chips & accompanying info from around the house, fastener charts, photos of projects from step 1 thru step . . ., etc.
The Dremel Bit Guide :: this post is great for figuring out what bit to use on a project-- plus it gives you ideas on what to do with your Dremel tool. https://craftedincarhartt.wordpress.com/2015/02/10/the-diy-dremel-guide/