There are several factors to consider as to when to invest. First is your time frame. Are you a long term investor or a short term investor? Short term can be considered as holding your investment for a couple of days to weeks. Long term is holding for weeks to months or years. Short term investing requires you to study chart patterns to know when to buy and sell. Long term investment requires you to determine the long term trend of prices. As the market is entering a new bull cycle, that's the ideal time to buy.