I'm certainly not advocating
diving straight into stocks, sectors & markets you know nothing
about, but clinging rigidly to your
comfort zone may be just as / if not more dangerous for your health — being the best sailor on a ship ain't much use if it's sinking fast in the middle of the Atlantic... Stocks change, valuations change, markets change, economies change — to avoid risk, and to seek opportunity, you need to change also... The more flexible & varied your investment approach — in terms of perspective & analysis — the more you'll stack the deck in your favour.