When I was in college and starting out on my own my mother made a three ring binder for each of us with some of our favorite recipes.

In this day and age, when my children ask for recipes, I often scan and email, sometimes text (if the instructions are brief), but I have also made a series of videos and put them on YouTube. They're not public, though I suppose someone could stumble upon them. Often times someone has already made a good one (in the same informal manner as I did), so I send the link.