Read "The sequences" [0], may be the Harry Potter and method of rationality book.

For lesswrong (and the Rationalist community in general), I've found that their "broad stroke idea" is what brings the most value. The more in-depth discussions bringing those ideas to specific topics is intriguing to read, but probably much less valuable for daily life.

[0]: https://www.lesswrong.com/rationality

The site has a "curated" feed with articles the moderators deem to be useful.

What value you'll derive from it varies (especially if you're not into AI alignment) but there are a few gems every few weeks.