Secure Filter Hook

In the FAQ area you have:

Is there a hook or filter to force pages to be secure?

Then show the filer below. Where does it go? functions.php file? is it a php code? or does it go in to the wp-config.php file?

Plus do you have a filter that does the opposite? Where it can turn the security off on a page? Or do I just change true to false?

I would like to use the / filter so all pages are automatically https but my google search results page because it doesn’t work under https only http. Thank You

https://wordpress.org/plugins/wordpress-https/