How the bitcoins works?

Though I am a newbie here. Based on my experience I earned bitcoin through typing captcha I used my bitcoin wallet to receive, purchasing, and and trade my earnings from Captcha. There a lot of ways where you can earn bitcoins and its really useful if you really love bitcoin currency. And I found this site that could make bitcoin more useful to me where I can earn by spending my time and sharing thoughts and to get more idea and knowledge on how the bitcoin really works.