How to really research individual stock picks

I've been putting my money into ETFs for years. I've made decent returns just based on that. Most of that has been just riding the bull market, but once in a while I've been lucky and bought an industry-focused ETF or something a little more niche for a shorter period of time ( usually under a year ). What I'd like to do is split off 10% of my portfolio and put it towards individual stocks that I take the time to research and invest in for short to mid-term. I'm not interested in taking my money

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