Just like what I've said in a different post with the same question as this, I suggest you stay in particular forum and then read different posts you think will give you information, background about certain topics and how transactions work here. There's no such thing as earning bitcoin fast, you have to work it out, have a lot of patience and perseverance. So here's the list how to earn bitcoins.
1. SIGNATURE CAMPAIGN: It is the easiest way to earn bitcoin, you just have to justify the required post per week campaign in order to receive payment.
What is a signature campaign?
A signature campaign is often organized by an individual, group or company who want to promote a certain coin, platform or service.
You will often see an open signature campaigns here
https://bitcointalk.org/index.php?board=52.0The work that you'll be doing depends on what rank you have, usually campaign managers hire applicants with the jr. member rank and above
This link is for the computation and information about account ranking
https://bitcointalk.org/index.php?topic=178608.0 2. GAMBLING: I'm not recommending this for beginners and those who people who are not ready for an easy come and easy go play of bitcoins. It is a risky move to play gambling but many sites provide faucets for gambling. There are pros and cos in gambling, if luck is with you you'll earn in just a click but then it can also disappear in just a blink of an eye.
3. TRADING: In trading you can earn quickly but you have to have proper knowledge about trading and what coin is the best to invest with. People who are not really knowledgable regarding this matter doesn't have a good investment plan and just buying coins without deep analyzation so the return of investment is hard to observe. The common and the most effective way is to search for the coin you want to invest with.
"BUY LOW AND SELL HIGH" - This is the most given tip by those people who are involved in trading. It's a really effective strategy, you buy coins when their value dropped then wait for the time that their value goes up again then sell them for a higher price.
So here are 2 of the most trusted trading sites bittrex.com and poloniex.com