There is no need for investors to make mistakes of others in the past by putting everything on the line due to their fears. Control emotional trading, regularly do an analysis of the market (both tech and fundamental) and keep calm mind all the time.
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Smart investors know they should always put their focus on the long term as long as they trust in the potential of the market they are holding and that makes them to take decisions like buying at times like this in the market than panicking and then be patient enough to wait until they get the best from that market.