Eric Ruthenberg's website:
Jenny Neale’s website:
Matlock Camera Club Forum:
North & East Midlands Photographic Federation:
Professional Photographer Magazine:
Royal Photographic Society:
The London Salon:
A useful link to a glossary of tools and terms used in Photoshop:
https://www.uprinting.com/printing-glossary-of-tools-and-terms-for-photoshop.html
Photo Tips Galore