We usually think about only one aspect of investment - only about money and practically never think about the second one, and more important in my opinion, - time.
Every time when we try to invest we always spent some our time for making research and comparing options.
I feel like every wise investment has balanced money and time for this investment.
Say, you spent 6 years in a law school. I would consider this time investment more efficient than spent 4 years in a community college and some economic knowledge about nothing.
I often see "successful" stories promoted on webinars about buying goods on Amazon and then selling these on eBay with 5$ profit. Those stories always have the same refrain - do this 100 times and get $500 as a result.
I could consider this money recipe neither smart nor wise - too much time involved to get that small money.
Instead of considering only money factor for your investment, try always count time also. I usually use simple math before doing any investment: (estimated money profit)/(estimated your own time efforts) for the simplest calculation and for more advanced data I also devid the result from the simple estimate on (invested money amount)