I am looking for the definition of the anticanonical bundle of an algebraic variety. In the books, I only find the definition of the canonical bundle.
Question 1 : Could anyone write me this definition? It would help me a lot.
Question 2 : Do you have any reference about the bundles, the divisors, and the relationship between them, to advise? If possible not too abstract. For example, I really like the notes of Gathmann about Algebraic Geometry.
Thank you very much!