I started dabbling in Bitcoin many years ago. In retrospect, my biggest regret is not investing in some of the most important altcoins when they were very cheap. For example, it pains me to think that going all in on Ether in the first couple of months of 2017, would've resulted in a 100-fold growth of my crypto portfolio in a year. Such mind-blowing growth is very rare. I should've learned earlier about altcoins.