If you're coding, you don't have to understand how to implement control flow. The average C programmer hasn't a clue how the underlying control flow is implemented. It's an _implementor_ of an interpreter or compiler who needs to understand this. Forth is no different from C or any other language in this regard, except that, in Forth, control flow can be implemented directly rather than relying on the compiler or interpreter to understand them.

Immediate words are essentially a kind of macro, if it makes things easier for you.