Question about jquery targeting specific child element

So in pic bellow i learned how to select specific child of element, previously i found out that parent, parents and children functions work for nested elements only, finnaly. So now im curious if function .target:nth- child(n) targets child of all nested elements in a document? Example is down bellow.

Ok so it basicaly targets every single for example second element of every div in a document? Did i understand this correctly? nth means nearest?