Undefined behavior is something that you will avoid - of course, only if you know the language pretty well.
replyUB is basically impossible to avoid in practice--that is why the Linux kernel forced GCC to add a bunch of flags to "do what I mean", making UB defined in those cases.
reply> The idea that C is a smol language that can be completely understood by one person is one of those myths that need to be put to bed
replyYou don’t need to understand the language completely. You only need to understand the general semantics and refer to the standard and docs to get the semantics down. That’s what they’re here for.