C has a really simple model with regard to storage durations, but the usage/omission of the respective keywords (static, extern, auto) is what makes it hard for

C has a really simple model with regard to storage durations, but the usage/omission of the respective keywords (static, extern, auto) is what makes it hard for beginners, IMO. `static` means different things at file scope and at block scope, `extern` is redundant most of the time (except when linking to an object from another unit), `auto` is 100% redundant and is a leftover from the days when `int` was implied for every declaration.