Your mentality can change your whole outlook on money, saving and investing. What is money really worth? And how can realising it’s potential value change your behaviour.
Passive investing is about growing your capital with little requirement for time and skill. You will be looking for a system you can repeat and possibly automate, with no/low setup fees and low ongoing costs.
I saw a way that I could grow my Lego business. To start out, selling used lego as well as purchasing some new sets to part-out (more on that later) would allow me to build some initial capital. I would then use that capital to invest in more stock, to re-sell for a profit.