Just guessing that you're relatively new to investing or been nibbling for years but now looking to go deeper.
Determine your goal. Is this future you money or trip to vegas next summer money? If future - drop the individual stocks till you have a better grasp. Buy a couple nice ETF's and chill. Vegas money - double down and let it ride.
Stop chasing flavor of the month. Research companies and know them. Invest and DCA into them. A wise man once said "Invest in what you know". Basically if everyone you know has an iPhone look into Apple. Love them burritos and local chain always packed - look into Chipotle. Etc.
Stop looking too often. Fund account on payday and set limit orders at YOUR price. Where you think it's fairly under valued. If you like/buy it at 60 and the price goes to 55 then buy more provided nothing has changed.
Most importantly - study and learn why the market does what it does. Libraries and the internet are filled with knowledge. We are likely going into a recession and both shitty and good companies aee going to get smoked in the market. Be ready for the next up swing with cash on hand.
Good luck.