What is the most confusing thing in Programming🐍

Two things:

1. Cache invalidation
2. Naming things
3. Off-by-one errors

Explaining it from the ground up. I just talked to a security guard at Railsconf who was curious about what "Rails" was. Trying to explain programming from the absolute basics is really tough.

Talking about learning the basics, I remember that a lot of students in my school where struggling with array starting at 0; ending at n-1 and same for the for loop