3. Affiliate system: the idea is pretty simple, you should try to sell any product and after-sale you will receive a Commission, the interesting thing about this system is that you can earn up to 75% of the selling price of the product, such as if you can sell a product for $100 you can get $75. Clickbank is one of the best affiliate  companies.
This is some good affiliate system.

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• Amazon Affiliate program
• Commission Junction
• Clickbank
• ShareASale
• Ebay Partner Network
• Google Affiliate Network
• Digiresult
• Maxbounty

Pro: It is a relatively simple system and can generate lots of income from an affiliate marketing.
Against: It is necessary that you choose a good affiliate platform, so a little research will required.
 4. Money with free market Work your self Get More income