I do keep this small notebook on my desk to note things that pop into my head or that I think I may want to keep. It has a few recipes and things like safe temperatures for different foods etc. To be honest I don't use it that much.
I'm more inclined to look things up online and if something really takes my fancy, print it out and keep in this folder.
It too has a few recipes and things like this Fahrenheit to Celcius converter for those America recipes which insist on using antediluvian measuring systems.
More often, I'm inclined to scribble down a list of ingredients and perhaps a highly abbreviated method on one of these 9cm square pieces of paper which live in a box, also on my desk, then hang it from this hook above the counter. Yes, they do get a bit splashed sometimes. So, do I.
All that said, I seldom cook from recipes,so I mainly just note down little things like say, a temperature and timing for roasting quail.