A Risk Score of 10 means no risk. A Return Score of 1 means the returns are horrible compared to the risk-free rate. A Feasibility score of 10 means everybody can do it. A Liquidity Score of 1 means it’s very difficult to withdraw your money without a massive penalty. An Activity Score of 10 means you can kick back and do nothing to earn income. To make the ranking as realistic as possible, every score is relative to each other. Furthermore, the return criteria is based off trying to generate $10,000 a year in passive income.
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.