I was advised to invest every month, always putting something into investments, no matter how small.



I was doing that for a while, but lately I've allocated nothing to real estate or ETFs.



Instead, I've been investing in myself and in my own business endeavors, purchasing gear and training for my PMC work.



Is this within the spirit and wisdom of the "invest every month" rule, or should I still set something aside for investments with a guaranteed return?