It would be helpful if it would easier to access the lessons. I would hope that once I have entered as a member, automatically it would go to where I was the previous day.
Regarding the content, I am very satisfied as it gives clear explanations. I tried Duolingo but they lack grammar and context. Doing both in parallel is not a bad idea.
Congratulations!
You can mark each lesson as completed. When you do that, you will always know where to continue.