Should I buy a stock right when the market opens?

I’m not giving you any advice on the stock market but as for me, I did both. I brought stocks when the market opens and I brought stocks later in the day and what I have found was that did not matter when I brought the stocks. When I brought stocks when the market opens, the price of the stock was down .20 cents but later that day the price dropped .50 cents so I should have waited until later to buy. On the flip side, the stock opened .50 cents lower but then later it was up .25 cents so I should have brought when the market opens. So to me, it does not matter when you buy a stock but make should you try to get the stock at a cheap price. I have a video below to go in more detail: