I did Duo Korean for a while with my SO. We got stuck on a section that started introducing a lot of proper names for people - the grammar around it was really

I did Duo Korean for a while with my SO. We got stuck on a section that started introducing a lot of proper names for people - the grammar around it was really confusing. After a few weeks of struggling, we discovered the website had PAGES of grammar notes for the section we were on. It was impossible without them and the way it was introduced even on the website made progress feel very slow compared to the pacing up to that point. There was zero indication of the extra notes in the app and eventually googling the for tips on the duo section led us to a bunch of people complaining about it and linking to the notes. When the pacing is good though duo is fun and easy to do consistently. I'm sure it is not super effective after a certain point but I could definitely see myself navigating Seoul with just the lessons there. The hangul character lessons seemed well done.