@FoxKestrel: I think you got that all wrong. You aren't supposed to "pick a strategy", learn it and execute it like you're buying a set of golf clubs.
You need to find a niche that nobody but you can exploit.
1st: 90% of the business is just showing up each and every day
2nd: Have a journal you write each and every day. Major markets, major news, big movers in stocks, unusual volume.
3rd: Specialize. Find a market you can relate to and learn this market inside out. Pick a market nobody cares about. Can be a special set of stocks, can be an illiquid future, exotic currency, just not the stuff everyone and their mom trades.
If you trade Canadian Airline stocks, find out how their margins are, which airports they fly from, where they buy their fuel, how old their planes are...everything.
Just don't be as stupid and trade CL off of chart patterns or "orderflow" when you don't even know what the crack spread and average shipping rate is.
The best trade are those you enter when the muppets are hammering the buttons because of a headline they don't understand.
Know your market better than everybody else.
4th: Fit your infrastructure to your market, not the other way around. I see a ton of people trading FX or "the ES" because software is free and commissions are cheap.
5th: Build watchlists of correlated markets around the market you trade. There is always a lead/lag relationship and especially when correlations break down, it's the first hint that things are changing. If you trade Canadian airline stocks, look at CL, the USD/CAD, the sector ETF, etc.
Don't ever trade a market in isolation. A long as you don't exploit microstructure, context is king.
6th: Learn the exchange rules!!! Know how the matching engine works, learn how a fast market is defined, learn the circuit breakers, learn about trade busting, clearning, everything that concerns how you actually exchange stuff with your counterparty. You don't want to lose money due to not knowing the rules and on the other hand there are many simple trades that exploit those rules. Ask those who traded EUREX settlement prices pre 2012...never lost a single trade.
7th: If you cannot explain to a dude who doesn't trade how and why you make your money, you don't have a strategy.
It probably takes 3 years of dedication and practise to turn the corner and probably another 1-3 years of grinding until you make decent money. Don't read books about strategies or blogs or youtube videos about daytrading. Pick a market and ask yourself if and how you can make money there, then get to work. Use your brain first, watchlists second, orderbook third and charts last.