I wouldn't say I made the mistake of not investing much more a few years back, mainly for not having a stable income to be able to do so. I am glad that I at least got exposed to the concept and various platforms to invest and understand a thing or two about it.

A mistake I made was not monitoring my portfolio with due diligence and I have lost quite a bit from errors adding up. I did not really track all my investments properly in one place, as such I let a few investments slip my mind, and some turned out poorly over the years - which could have been avoided with close monitoring. Fees and ease of accessibility was also a problem for me when I first started out, which will also vary depending on your location.

I think investing in your career and goals come first, then investing a side portion of a stable income can run alongside you.