Check out example codes for "icon material design google fonctionnemnt". It will help you in understanding the concepts better.

Code Example 1

<i class="material-icons">account_balance_outlined</i>
<i class="material-icons material-icons-outlined">account_balance</i>

Code Example 2

<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">

Learn ReactJs, React Native from akashmittal.com