Don't know about fear and greed as these are emotional quotients. But I can certainly vouch for "Stop loss" as this is a very basic mistake made by every single trader during their initial days of trading. I repeat, every single trader has done this mistake by not putting a "stop loss".

Let me share one of my experiences with you. In 2011, I used to work with a well known stock broking company as a customer service executive. We were the ones who used to get the trade recommendation of that day before anyone else. That was the first day of the month and I had just received my salary so I decided to try my luck with one of the recommendations. Every recommendation comes with a stop loss amount as well. However, when I placed the trade as soon as the market opens up, I simply ignored the stop loss. Within next 3 minutes, I had lost 70% of my salary because I didn't set up the stop loss. That month, I had to borrow money from my dad to cover my travelling expenses. That is one of the greatest lesson I learned that day for stop loss.

Ignoring stop loss can be super fatal that I learned the hard way!