You Can Earn with Many Methods, But give some dedication to it.

1. Earn through Faucets. There are Many.
2. Take Part in Signature Campaigns ( You should be atleast a Member for getting better Pay )
3. Know something Useful, Go to the Service Announcements Thread and Post what you can offer.
4. Earn through PTC Sites. Although Many may become Scam before you even reach Minimum Payout.
5. Invest Some Money from your Pocket (that you can afford to lose) in some good Project. You can Also invest Money in Revshares. There are many
    which are Popular like MyPayingAds, 10adspay, MPCA.
6. Invest some money in Crypto Currencies that can give you Profit like ETH, BTC, FCT etc...
7. Invest some money in Hardwares like GPUs. You can Mine Profitable Crypto Currencies.

8. The Above all can earn you money if you are SERIOUS and not posting only for FUN.

Good Luck.

To mine bitcoin you need to have a mining hardware like bitmain and their most power ASIC mining machines and it will cost you around two thousand dollars per device and then electricity is another concern ,if you are a big investor you can start your own mining rig and try checking about mining Alt coins too and if you are intereted i will explain in detail.