Hello!
I’ve just recently started with wanikani and plan to stick here for a long time. Meanwhile I’ve got some question. I suppose it might be already answered, but I was not successful at finding the info.
The guide and FAQ both recommend the EtoEto textbook for starting with grammar, but when I go through the link, I only see the ‘coming soon’ banner and registration button for alpha testers.
Is it not open yet? Why does wanikani recommend it then?
Could anybody please give me just a small hint, where to start with grammar? I suppose I could start working on that while waiting hours for review on wanikani 
Thank you in advance and sorry if my question is not appropriate or is in wrong place.