Few language learners don't know of Duolingo. But I have two small issues:

1. Sometimes the notes there or the lessons are a little confusing (at least for me).
2. The tips/notes aren't available to mobile users (unless you select to view original/desktop page which is a little ugly on mobile).

I have tried to link below to lesson notes for myself, a copy of the tips (only for me because of copyright) and the lesson page. Some kind people are copying lesson tips to this wikia location which is also growing out Romanian notes: http://duonotes.wikia.com/wiki/Romanian