For Ancient Greek enthusiasts I wanted to share two online-courses (old but gold!) in German that I have enjoyed very much. Both are really focused on grammar but teach it in small steps. Of course everything can be transferred into Lingq but at the loss of the explanations and exercises. As a classical philologist I can only say that Latin and Greek writings miss so much about their genius, rhetoric and meaning without proper understanding of their grammar in a way that modern languages are just not able to (well, having a much easier language must also have a downside).
Have a nice day!