Any tutorials… only about eight million of them, give or take.
Also, here are my own mumblings about load/save. Start small, iterate, don’t try to save / load EVERYTHING at once, you will never get through it.
Load/Save steps:
https://discussions.unity.com/t/799896/4
Don’t use the binary formatter/serializer: it is insecure, it cannot be made secure, and it makes debugging very difficult, plus it actually will NOT prevent people from modifying your save data on their computers.