> when do you say "I know enough" about any particular topic?

Never. That's the trick. There is no good answer to this question. Only the one which works for you.

You need some to come up with some other mechanisms to trigger your move-onto next stuff (or stay-on subject depending on natural tendencies).

Overall my strategy is keeping my core competencies sharp. Don't be early adopter, but keep an eye on them to pick up when things more or less prooved their workability.

The things outside of my core I dig as much as I'm interested or as much as task requires. This gives freedom to pursue whatever seems to be interesting.

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> In 2025, with everything in tech changing by the minute,

Based on what do you build that? Based on news?

It's a FOMO. Are there objective reasons for feeding that feeling?