Ah ! I finally found a way to contact moderators and contributors ! I never looked at the Discussion tab before as I had thought it was only related to comments out each question, until today!
Actually all I wanted to say was thank you so much to all the moderators and the contributors! I've only picked up a few languages to play on Duolingo but from my experience the Czech tips and notes are the best! They usually are so clear that going into a lesson you may not have to learn by first making a mistake, not that it means I don't make many mistakes, and that decreases the frustration.
I'm looking forward to when the course becomes available on mobile!
Thank you so much, the Czech moderator and contributor teams !
Děký for your comment. I wanted to say the course is coming along really well. I am also really keen to see Czech on the app and to join a Czech club.