Understanding and knowing lens aperture sizes is critically important to being to the best and most creatively free photographer you can be. Below is one of my classic photography lessons on apertures sizes. You can use it as a useful guide if you’re just learning about aperture or if you need a refreshers course on it.
This is from the “intermediate section” of my online photography school (I offer beginner, intermediate, and advanced – all for free). You can check it out HERE as well as print “homework” and visit my other helpful links and resources.