Personally, i have not done well buying the dip. Its a falling knife for a reason. $Pfizer(PFE)$ was a great example, great company but just kept going lower. But thats a cyclical stock.
I think buying the dip requires one fundamental. Knowledge. This month i have been buying $Schwab US Dividend Equity ETF(SCHD)$ and $Realty Income(O)$. Why? Because i sold them both at a nice profit, I understand both companies very well, both dividend stocks that when i sold didn’t have the same allure going forward. With schd, the dividend yield wasn’t as consistent as others, with O the yield was low. But for both now, due to the price drop, totally different. Both are solid investments, and their price vs return are too good to refuse.