I may be young and dumb, but C programming seems very simple and straightforward to me. With abstraction comes lack of knowledge of implementation in favor of ease of use; but in C you can build your own abstractions quickly and reach a level close to even JS (opaque types, function pointers). At least in C you know exactly what is going on.

Can someone briefly summarize the security issues in C? If you manage memory properly and take a conservative approach to handling input, where is the risk?

Like I said, I'm young and have only be programming in C for ~3 years.