The other day Scott Alexander wrote a piece focusing on a few of the various jhana states of meditation. This falls pretty firmly into the category of “stuff I don’t know much about”, but he linked to an explainer of the general states here: As you reach each jhanic level, your mind will be tempted to remain at the previous jhanic state. Simply keep a balanced mind with no clinging to the pleasant or unpleasant and you will progress to the higher levels. The nine levels of jhana are: