Custom font family or change it in scss

[ulf-frostypaw]

Hello. I'm doing my project in react and I'm using Sass for a custom theme, but I would like to use a different font than the default one. Is there any way to change it?
For example,

$font-family: "Poppins", sans-serif;
$font-weight: 400;

I don't know if there is a more efficient way to do this, and the documentation is not very clear on that aspect. I hope someone can help me. Thanks.