Do you want to check your fundamental knowledge of Front End Developer? Check if you can deal with selectors! You can do it on this page:
https://flukeout.github.io/
In this simple app you can check your knowledge about selectors based on:
element
#id
element in element
#id A
.classname
element.className
Put your back into it!
tag, tag (list of element)
*
element *
element + element
element ~ element
element > element
:first-child
:only-child
:last-child
:nth-child(A)
:nth-last-child(A)
:first-of-type
:nth-of-type(A)
:nth-of-type(An+B)
:only-of-type
:last-of-type
:empty
:not(X)
So if you want to learn it just check it out! If you know it you should check it if you dont lie : )