What is the following function of some classes in this Navbar code?

Question

I founded that i cant learn some classes in SoloLearn. Like this :

<div class="container">
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
</nav>
</div>

Can tell me the function of those classes?

And also, i got that code here :

https://getbootstrap.com/docs/4.1/components/navbar/

Answer 1

https://www.sololearn.com/learn/1592/?ref=app

Answer 2

..... I can't tell if you're joking or not. The link that you posted answers exactly what you're asking in detail.

Answer 3

Fata1 Err0r Well, actually i don't really get it, that's why I asked,,

Answer 4

Muhd Khairul Amirin Bin Yaacob Thank you.