How to fix 500 Internal Server error on WordPress website?

Declaration: If you don't know or do not have any idea about the points mentioned below, Please do not proceed and its recommended to consult the right person who know what they are doing or Developer/Agency. One wrong step can mess up the things.

Happy Troubleshooting. 

If you are facing this issue on your WordPress website you can troubleshoot your website as per the points mentioned below one by one:

1. Through FTP rename your .htaccess file. and check your website.
2. Increase the PHP Memory Limit and check your website.
3. Rename your plugin folder and check your website.
4. Reload WP core files and check your website (This option has fixed this issue most of the times).
5. Contact your hosting provider.

Reference Websites:

https://www.elegantthemes.com/blog/tips-tricks/how-to-fix-the-500-internal-server-error-on-your-wordpress-website

http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-internal-server-error-in-wordpress/