css first child does for every code example

Example 1: css first child

:first-child {
	//styles here
}

:nth-child(1) { //the benefit of this is you can do it for 2nd, 3rd etc...
	//styles here 
}

Example 2: select first 5 child css

li:nth-child(-n+5) {
    color: green;   
}