I use stockcharts.com. I look for stocks making new highs. I use price and volume and volatility as a filter. Throw in a few set-up rules and a little money management and you have a trading strategy.
You have to be an Expert at Something. I have never met an expert at everything. Be a specialists at something, just like a doctor with a specific focus.
%% MOSTLY ETFs out of my trading notebook\ about 80% of them have real good volume like SPXS,SPXS,sds, SH................. SOME others , wide bid\ask spread/LOL I also study some single stocks but dont trade those anymore, but since they move more than almost any ETF, helps with ETF price shocks
I use both methods. I trade certain stocks on a regular basis. Those are ones that I've researched and traded previously so I'm fairly confident in how they will perform. And I trade stocks that are volatile on a given day, those may be different each day.