To absolutely make sure that your website is secure and you are using correct permissions for your folders, use a security plugin like these:
https://en-ca.wordpress.org/plugins/all-in-one-wp-security-and-firewall/
https://en-ca.wordpress.org/plugins/wordfence/
These plugins will scan your Wordpress installation and notify you about any potential issues. These will also warn you about any insecure folder permissions. In addition to that, these plugins will recommend you what permissions should be assigned to the folders.