The money that you
truly need access to at all times and that you really can't afford to put at any risk — say, a cash reserve
for emergencies and unexpected expenses, cash to pay a year - to - two's worth of
retirement expenses beyond what Social Security and any pensions would cover — would go into the most secure and most liquid investments, by which I mean an FDIC - insured
savings account or money - market account and / or a highly secure investments like a money - market fund.