Great Investment Mistakes And How To Avoid Them

Hi everyone,
New on the forum and have greatly enjoyed the topics initiated by experts in the house and contributions of others. Names like seun, frankiri, MT needs be mentioned among many others. You all have been wonderful.
From the topics and responses in the posts so far placed, i have observed that experts warn new comers to the stock market and experienced ones to be cautious before taking invesment decisions. To me it means experts in the house must have made some mistakes in the past or have seen people who burn their fingers through ignorance or for other reasons.
I want you experts there to share with nairanlanders your greatest investment mistake(s) and how to avoid them.  They say experience is the best teacher. I believe this thread will help to further make us wiser as investors in the Nigerian stock market.
Over to you brokers, analysts and investors in the house
cheers