How can I eliminate render-blocking resources?

You can eliminate all render-blocking resources by deferring all non-critical JavaScript and CSS files.

You can defer your JavaScript files by going to WP-Optimize > Minify > JavaScript and going to the ‘Load JavaScript asynchronously’ section.

For more precise steps on how to defer your JavaScript files go here.

You can defer your CSS files by going to WP-Optimize > Minify > CSS and going to the ‘Load the following CSS files asynchronously’ section.

For more precise steps on how to defer your CSS files, go through this.