I got interested a few years back thanks to Derren Brown's book "Happy" (recommended). I have found it helpful. I can't say I actually do any of the exercises, but it has slightly reframed how I think about my own wellbeing and happiness.

edit: I've missed all this new bite sized version stuff though precisely because I avoid bite size stuff like the plague. TikTok and the TikTokification of everything else can fuck right off. I'm looking at you, YouTube.