Pre course work

I will be attending the Power BI course on 24 & 25 April. I would like to get a head start as I am totally new to Power BI and was wondering if you could please advise me of me what modules I could look at online prior to starting the course. I would really like to familiarise myself with some of the topics beforehand so the new course work won't be too much. I have read that some candidates joining these courses have some previous knowledge so I would like to be able to keep up to speed. I would like to start on this asap please. Many thanks.