ISO27001 specific material
- http://www.iso27001security.com/
- Toolkit with a lot of templates and handy material at : http://www.iso27001security.com/html/toolkit.html
BTW: there is a very interesting GDPR-ISO27001 mapping example/exercise published on the ISO27001Security.com website: GDPR-ISO27k mapping
PCI-DSS
And as a surplus, have a read of the PCI-DSS, aka the ISO27001 for finance
Check the free download section of the ISO standards organization at: ffwd2.me/FreeISO