Learning Croatian

Good morning everyone, I would like to start learning Croatian. I heard it quite often during my university studies, but I never actually learned it. I have focused on the history of Yugoslavia and the figure of Tito in particular, but I have often come across sources in Serbo-Croatian that I couldn't read. Could you recommend any online courses (preferably free) or some PDFs to get started? If possible, I would prefer resources that teach Croatian through Italian. Thanks in advance!