Every grammar topic of the course on one page each: the rule in plain English, tables, typical mistakes and eight practice questions with explanations.
The topics are sorted by CEFR level, from your first sentences at A1 to the fine points of C2. Each page links to the course lessons where the grammar is practised in context. If you are not sure where to start, take the placement test first.
Grammar is a tool, not the goal: read the rule, do the practice questions, then go back to a lesson and use the structure in your own sentences. The verb trainer, the conjugator and the connectors trainer help with the parts most learners find hardest.