I've also got a notebook that I carry around with me and I use to take notes more broadly. I find pen & paper to be my most useful note-taking tool by far, but I run into issues when I'm reading something on my phone when I'm out and about and don't have my notebook with me, or when I want to take note of a specific code or more technical concepts that are cumbersome to write down by hand.
In such cases, I tend to save the article to Pocket. Then on weekends when I'm reading from Pocket I write down the notes. Revises the knowledge.
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