I came across this site earlier today:
When it comes to CSS, writing the correct selector is the hardest part. This site has a nice way of introducing and teaching about the different types of selectors available to you.
Though its CSS focused, these same selectors should all work within document.querySelector() function or within jquery's $() so it has usage beyond just CSS. Personally I didn't know about the formula support within :nth-of-type(An+B).
When it comes to CSS, writing the correct selector is the hardest part. This site has a nice way of introducing and teaching about the different types of selectors available to you.
Though its CSS focused, these same selectors should all work within document.querySelector() function or within jquery's $() so it has usage beyond just CSS. Personally I didn't know about the formula support within :nth-of-type(An+B).