This may seem obvious – but I’ve discovered a wonderful trick if you ever need to review a science topic quickly or are trying to learn something new, try searching google like this:
(topic) + Lecture filetype:pdf
You’ll find that tons of professors post their lecture notes online. Also try using filetype:ppt or leave filetype off (as some professors host websites with lecture notes).
Google results found when searching ‘Microarray + lecture filetype:pdf’