Pro earthing, anti vax... sigh. Some particular vaccines may be useless/dangerous, but vaccines as a technology is what made humans reach the lifespan we have today.
Science is not a conspiracy. This is the scientific method :
https://www.youtube.com/watch?v=EYPapE-3FRw, you don't need much more epistemology than that.
My own reading advices would be Ben Goldacre, an epidemiologist and psychiatrist, author of books "Bad Science" and "Bad Pharma". This poor fellow is an unsung hero, fighting on 2 fronts, against anti-science propaganda on the one hand, and against the ignoble practices of big pharma on the other hand.