If not, I write on anything available. Those notes are dropped into a pretty, lidded box, big enough to let notebook paper lie flat. Every week or so I incorporate, reviewing at the same time, the loose notes into the computer notes. Ten or so years from now, this can all be formatted and printed out in a pretty font on pretty paper to make An Attractive Learning Journal. Obssessing over where I left which notebook uses up my limited study time.
Words are so neat and there are such geniuses out there.
Consequently I have notes everywhere, written on everything, including important phone numbers penciled inside my un-loseable cabinet door. About half of my serious study is noted at the computer and the other half is done during waiting times at many locations. If I'm lucky, I have my zippered loose-leaf notebook with me. If not, I write on anything available. Those notes are dropped into a pretty, lidded box, big enough to let notebook paper lie flat.