As a beginner I often found myself saying "This is so useless. How can this ever help me?" only to find out later on that it is essential and I was a fool.

The moral, however, tends to be that the C or the C++ language are perfect and they contain nothing of no-use to programmers.

I'm asking this question for 2 reasons: out of pure curiosity and so that I may know what not to learn.

In a nutshell - are there any useless language features in the C or the C++ language, which good programmers almost never use? It would also be of great help if you would mention weather they are a bad practice when used or just purely useless.