While I like your 10 list and understand that most such lists have 10, not 9 or 11, I might add the following skills or knowledge to the retail trader:
11. Of the 1982 current "trade rooms", just about 99.6% do not trade but sell (i.e. all vendor/no trader).
12. Therefore all of their revenue comes from selling goods and services and education to the retail trader.
13. Since they sell and do not trade, 99.6% do not have a track record
14. As a retail trader, you cannot learn what is not traded, not measured and not shown.