For me, it’s been the paper and pen.
When I started my career in the early
1990s I was a school teacher and pens and paper were a big deal. By the time I got to the corporate world, I didn’t go anywhere without a decent pen and notebook. But over the last year, tech has caught up and I’ve completely ditched the pen and paper. I do all my note-taking using a tablet and stylus. I never lose a scrap of paper, it’s all instantly backed up and one tool can be used for drawing in different colours, highlighting and writing.