Went through this resurrected ever-green thread from the very beginning, here is a quick summary in order of advice frequency, if you are in a hurry:
- let profits run, add to winning positions;
- cut losses;
- never trade on margin;
- risk management first, always fear about losing everything you have at the moment;
- turn off TV, don't read forums or follow someone else advice;
- trading is an art, not a science, focus on discretionary trading, develop your personal skill;
- learn yourself more than the market.
Nothing new, it's their order that may be important
PS: My first idea when I came to trading was betting against the Average Joe. Not "buy what he sells" but follow inverse fundamental principles. I came to almost the same list at the end, which is interesting by itself, especially adding to winning positions at the first place.