What is PTC, PTR, GPT, Adsense, or else?

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Helloo.. I know that many people decided to earn money online. The top one is PTC, PTR, GPT, Adsense, or else. 1. Can you explain me what i have to do to earn money with that?? 2. How the website like neobux get money and paid it to the member?? 3. I heard there are direct referrals and rented referrals. What's the differences of both? 4. Is it tru that we can earn BIG money online? thank you,, i'm sorry i'm a newbie..