It's proved and highly recommended not to trade on Mondays, when the market has recently awaken and is making first "probation steps" to form a new or confirm a current trend; and on Fridays afternoon, during the huge volume of closing trades. The best days to trade are Tuesdays, Wednesdays and Thursdays.
Tip 22. There is no such thing as a secret approach to understanding the market.
Take the time to develop a solid trading system and find out that the secret to trading success lies in hard work and constant learning.