Ganoksin is an American based site, that hosts all sorts of useful articles and information for jewellers - most of which can be accessed for free...
They do also have a paid membership option where you can access forums, and list your business, as well as gain discounts with a variety of suppliers, but as a free - non-member, you get free access to their huge library of learning resources including articles, videos and some step by step tutorials here at - https://www.ganoksin.com/learning-center/