There is so much in this article that helped clear some of the fog of CSS Flex and CSS Grid for me. For some reason over the years, I kept going back to CSS Flex to center things because Grid would randomly "act weird". I thought it was something I was doing but Flex would center every time.

Cool to know the reason why. See the "Differences from Flexbox" section under "Centering with CSS Grid"

[Whole article]