Investing psychology is even more important when investing in the stock market than financial analysis.
Behavioral finance is an excellent way to get to know yourself that can prevent you from making terrible investment mistakes.
Investing mistakes lead to terrible investing returns even if the stock market performs well.
Especially stock market beginners get under behavioral influences. Concepts like loss aversion, the emotional investing cycle, recency bias, probability neglect can really help you do well even if a stock market crash or stock market collapse comes in 2018. Such psychological principles are also applicable to personal finances.