Help needed about "Additionally, a 500 Internal Server Error"

[Arthur]

Error 500 is caused by:
1. Corrupt htaccess files.
2. Invalid/improper system/file permissions.
3. Out of memory or script exhausted, google: 500 error wordpress and you will get a line of code that needs to be added to your wp-config.php. You don't have enough memory, i mean the script

hmmm alrite then why don't u tell me the working method to get rid of this error please?