Well these might be your own analysis of topics to look at in trading but it is relative because different people/traders have what they look out for in trading based on their own biase. Thus, there are so many useful topics online regards to how a trader can be better in his skill and strategy.
For me, I have identified that traders struggle with some of these factors below:
Greed: This is a major back bone breaker for traders. If you get greedy, you may likely regret it. Like you are using leverage that puts your account at risk.
Fear: Not able to take the needed decision when you see a profitable trading decision. You could take such decision when it is late and regret it. For example, you have a good order to be taken for buy early and because of fear, you enter late when buyers are already going off the market. So what do you think will happen?

Emotion: Not having the right confidence to take up trade or exit which is a combination of greed and fear .
Trend: Very important because at all times it is better to be on the right trend. In futures market, they say both buyers and sellers are profitable but at what rate and risk. So to be on the right trend, gives you more confidence to successful trade.