I try to write them down on paper when I can.

Pinterest + 1000 notebooks!

Yes, in different notebooks, sketchbooks, digital documents and on my camera

I have a shelf dedicated to note books, which I try to keep organised and segmented (but that just doesn't happen). I also use my phone camera and notes app when a pen/pencil isn't within reach.

Sketchbooks, google Docs, I have a book of poetry, notebooks and learning journals, camera

In any notebook, notes on my phone. Journalling.