Heard great things on Language Transfer and started listening to it.
I've mostly been doing Duolingo, recently some tutored classes on Preply. Trying to get to a level where I can converse with my Italian partner.
And I think GPT has tremendous potential for this. Seen a few projects exploring this besides mine. Can't wait to see where it goes. It would be a shame if we can't figure out some great ways to use the new generative AI algos for education!