Handling .htaccess file for redirecting multiple websites

Hi all, here I am again, and by the way thanks all for the support, I really started understanding Magento a bit because of you.

After that said, as the title says I have some trouble on understanding how to edit my htaccess file to see my second website. I tried to set up like my default which is working, but nothing happen, shows me the “Whoops” page.

Thanks in advance for the help.

EDIT: I’m on Magento 2