Diversify. Don't put all your  money in one investment (unless it's an already diversified ETF, Exchange Traded Fund from a reputable ETF co.,  that represents a whole stock indexe such as the S&P 500 or  TSX 60).  Best to buy through reputable brokerages or reputable banks or their brokerages.  Warren Buffett advises avoiding ALL financial advisors and money managers that charge expensive fees because their fees eat up your profits rather than adding to them.

Instead, he advises buying and holding an ETF that represents the S&P 500. ETF's have tiny fees compared to 
regular mutual funds or professional advisors. Markets always go up over time, and you get paid company dividends along the way. Buffett says invest in the broad market, sit back, and let the market do its thing for you, i.e. give you capital gains and dividends - without fees taking them away from you.