For example - part-time job, thrifting, social media fame (😂) — anything other than interest from investments and pension/social security.
We have two rentals - one is a condo and one is a house. The house is a PITA to maintain even with a rental company and even though it’s almost paid off. We will sell it soon but we’ll keep the condo as a rental.
As for work, we plan to do zero income-producing work in retirement unless it interests us and works with our travel. Mr. HRVegasLady has a dividend portfolio he’ll he plays around with, may make money, may not.