It's Zen adjacent, so it seems suitable to share (only found the post because it made it's way to my 'top' feed) - https://www.dhamma.org/en/index
My closest centre is about an hour north, and it's free so how could I not at least try it the first time? I think I went 6 or 7 years in a row after that, only missing last year due to a somewhat prolonged death in the family.
The teachings and practices Goenka ji imparts have change my life and thinking in ways I couldn't have imagined possible before my first retreat.