How to Fix 500 Internal Server Error?

Step 1: Check for corrupt .htaccess rules
Step 2: Increase PHP Memory limit in WordPress
define(‘WP_MEMORY_LIMIT’, ’64M’);
ini_set(‘post_max_size’, ’64M’);
ini_set(‘upload_max_filesize’, ’64M’);
Step 3: Deactivate the faulty plugins via cpanel
Step 4: Check file permissions. (755 or 644)
Step 5: Upload core WordPress files to site via cPanel