When thinking about passive income generation, it is important to look at skills you already have, these may go a long way to providing you a vehicle for generating passive income.
I have a full time job, and a part time job. I do not do the part time job for the money, I love mentoring and teaching, so I am an adjunct at a local college. That said, one method of generating passive income is to develop a course on something you know well, or would be considered an expert in.
For example, if you are a lawyer and recently passed the bar, you could come up with course content relating to passing the bar, if you are a chef, perhaps a basic knife skills course, a day trader - a course on reading candlestick patterns, the list really does go on and on.
Of course there is an initial investment of time, but once the course is available, this could be something that you dedicate almost no time to that has a return. There are popular sites that you can host your content on (udemy, teachable, skillshare - being a few examples) and get paid when people buy your course. It may be worth researching google trends and similar to see how in demand this topic is before investing the time, but this one can have a huge return on investment. Even if there is a limited audience, you may be able to make some good side cash.
The time investment varies greatly, if you have never done any video production work (made youtube videos for example) it could be difficult to adjust to video editing, lighting, sound production and similar. That said, once this is done, it should be fairly straight forward. You by no means need to be great at this, a simple video will do in most cases, no rigorous editing or cuts would be required.
Time investment: 7/10
Potential income: 8/10
I am just a regular guy who does far to much research on financial independence and early retirement (FI/RE). I look forward to sharing my journey with you all.