The ultimate sin of investing is paying significantly too much for a security.
I say significantly because it is just about impossible to pay the lowest price. But, paying WAY TOO MUCH can kill an investment. For example, owning a stock that drops 90% because it was owned at a much higher price than it should have been is difficult to deal with. It is also easy to do.
So make sure that the price that is paid has a basis for doing so within the company's fundamentals.
This is not to say it will never happen, as the winds of time change. Every long-time investor has had this error. It is just a "rite of passage". The key is to learn from failures and make adjustments in approach.
For successful investors, the stock market is not a gambling casino with little slips of paper. The stock market is the chance to own a piece of a successful company's future.
Be smart, be well-read, be aware and be successful.
