During the second semester of 2020, we had to teach remotely online, be-cause of Covid-19. To simplify life for both my students and myself, I manually drafted notes in Italian, so that one day before the lesson they could receive a file on which to follow my explanations. For this year I decided to organize those drafts in English in order to be printed and here they are. The program consists of a short algebraic part and a part dedicated to finite geometric structures.