I've got a new one here - controlling your emotions.
Controlling your emotions while setting up a trade is one of the major aspects a very few people know and this thing can't literally be taught to any person as it needs to be conquered on our own. I believe that OP should compile a list of such opinions and put the best ones in the first post so to give a glimpse of the points that are needed to be taken into mind and learnt on our own before jiving into trading.
True!! Controlling emotions are critical for trading. Emotions affect our minds in making decisions and create greediness or fear of missing out. It's harmful to let emotions interrupt our decision. However, in order to control our emotions, we have no way but actually go through it by trading.