Orson Peters' recent post "Breaking CityHash64, MurmurHash2/3, wyhash, and more..." is a fantastic dive into hash collisions in common algorithms: https://orlp.net/blog/breaking-hash-functions/

PS. Want to confuse various network security scanners? MurmurHash3 collide your /favicon.ico file with something arcane. See previous work by Jorian Woltjer at https://jorianwoltjer.com/blog/p/coding/shodan-favicon-preimage