I like to use a mixture of digital and analogue ideas. I enjoy carrying around a small notebook with me that fits in my bag so that I can write ideas in it as they come to me. I sometimes also use my iPhone notes for this as well. 

In terms of digital tools, I like to use Google Docs when it comes to writing and building out pieces of work, drip-feeding ideas once they've started to already take shape. I use Notion as my catalogue where I document everything, linking back to the Google Docs I've created.