Posts about Happiness. One of the tricky things about Happiness is that sometimes directly pursuing it doesn't work or is even counterproductive. Happiness isn't (and can't be) the only important thing, but it is nonetheless important. Thus LessWrong dealt a lot with questions about happiness and how to pursue it.
“Happiness is a choice. If you’re so smart, how come you aren’t happy? How come you haven’t figured that out? That’s my challenge to all the people who think they’re so smart and so capable.” - Naval Ravikant
See also: Gratitude, Well-being