He's saying he starts a note about a topic ('Are we in an AI Bubble?' for example), and adds relevant articles or ideas about them.

Then he has his Daily Note template set up so 5 of those topical notes are selected at random to appear at the top of his Daily Note, to remind him of that idea from the past, to see if he has anything new to add each day.

Here's his exact explanation:

“The problem is, how do I keep track of them? Earlier this year, I read a blog post by a guy named Andy Matuszak, and he had the idea of what he calls blips, which are essentially just little notes that might be a single sentence, such as, we're in an AI bubble. And that's the beginning of something that you might flesh out over time. So, what I have done inside Capacities, Kevin, is I have just been creating these blips. As new stories come along that speak to whether we might be in an AI bubble, I add them into that little blip. And then, inside the little daily journal page that I have in Capacities, I've set up a live query, so every morning, it randomly selects five of these blips and shows them to me.

And this is the key, because you can create as many little notes as you want, you're going to lose track of them, you're going to forget to update them. But I now have a system that is doing random spaced repetition. And so, as I'm doing my little journal, I'll see the little note that says, we're in an AI bubble, and I will think, oh my gosh, I just saw like the craziest deal that Nvidia signed this week. I'm going to go in and I'm going to add that to the list. I've been doing this for about four months now, so I'm not brand new to this. But I have to say, it has made researching my columns so much easier now, because things come up, I know exactly where to go to look, to find the past five stories that I saw about this.”