Actual active investment takes a lot of time and is very hard work.
If you don't have the time, find a good low load index fund based on the S&P 500, the NASDAQ, or the Dow Jones if you are less aggressive.
I used to watch key segments of the market which I understood. Made a killing when Western Digital's first terabyte drive, started failing and their stock fell. And, because most investors had no idea about the technology, SeaGate stock followed it down. They both dropped so low the value of all their outstanding stock was less than half of their cash reserves on hand. So, I bought a bunch of Seagate and a bit of Western Digital. The next week I sold and more than tripled my money. I got out of the stock of home builders and mortgages too early, that market didn't collapse for a year after I bailed out.
Best investment return I ever had was on a sports bet. Sugar Ray Leonard versus Hearns. The boxing press had Sugar Ray winning the decision by two or three rounds. Las Vegas sprots books adjust their odds based on what the bettors are betting. I was driving home from work, the evening of the fight. Local news was saying Ceasars Palace was giving 30 to 1 against Sugar Ray. Everybody was betting on Hearns. I drained my bank account to put $2500 on Sugar Ray at a sports book near where I lived in Henderson, Nevada. They were only paying 25 to 1. Paid off the house. Funny part is even though I won, the significant other was still pissed that I had done it. It was only after her Dad talked to her about it that she finally calmed down.