Minify HTML, CSS and JS

Hello,

I was testing my site (http://lpprodutividade.com.br/) against the Google site speed testing tool (https://testmysite.thinkwithgoogle.com/), and one thing it recomended was to minify my css, html and java script.

I was wondering, is there a safe plugin to minify these elements inside the optimizer theme?
If there is no plugin, is there any other way to do it?

Cheers,
Leonardo