Changing File Permissions.

I want to lock down all my file permissions as much as possible and loosen those restrictions on the occasions that you need to allow write access – that is give write access only to user account on particular folders or files:

/
The root WordPress directory: all files should be writable only by your user account,

/wp-admin/
The WordPress administration area: all files should be writable only by your user account.

/wp-includes/
The bulk of WordPress application logic: all files should be writable only by your user account.

/wp-content/
User-supplied content: intended to be writable by your user account and the web server process.

Within /wp-content/ you will find:

/wp-content/themes/
Theme files. all files can be writable only by your user account.

/wp-content/plugins/
Plugin files: all files should be writable only by your user account.

I need to know if installing ithemes security does this automatically, or I would have to change these file permissions manually?

https://wordpress.org/plugins/better-wp-security/