flippersthe301stspartanEverything by Terry Pratchett.
If i were to read one book by him which would you reccomend.
That's really hard to say because there are very different "series" of them. Maybe Hogfather, but that would require minimal knowledge or the world I think.
If you have never read one, I would recommend with the first two, The colour of magic and The light fantastic. Then you can get into the different series and see which you like best. I personally like the Death and Rincewind books a lot.
tl;dr The colour of magic