Similarly, there are many other places online where you can earn. But don't think think that you will earn a huge money. It all depends on your hard work and skill. You may earn a few thousand per month on this online activities. I think it will be a breadwinner for a few but for many, these are little extra bucks in addition to their regular earnings from their regular job.
As you have started your journey in ISC you can start earning here by participating in forums, ask expert section, articles, job posting and many other activities which one way or another related to revnue generation.
Knowledge is power.