Error 500 message when trying to access my WP site

see this post :
https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/

Thanks! I read through it but don’t understand how to do a number of these functions. I will keep this site on hand and see if I can hire someone to help me. If anyone has any easy to understand instructions, I would love to know.

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