Find an active forum such as alt.comp.lang.learn.c-c++ or
http://cboard.cprogramming.com/ and read all of the threads. If the topic applies to what you're learning, great. If not, stick the information away for later use. If you feel confident answering a question then do so. The best thing that could happen is you get corrected in detail. This way you learn things that you would have missed otherwise.
The nice thing about this method is that if you participate in solving problems, you will further your own knowledge very quickly as well as help others. Newsgroups are better for lurking, while forums such as this one and Cboard are easier for trying your hand at answering questions.