What are the optional fields for Gatsby GraphQL?

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The optional fields for Gatsby GraphQL depend on the specific data sources and plugins being used, but some possible examples include:

• excerpt: a brief summary or excerpt of the content, often used for search results or teasers
• featuredImage: the primary image associated with the content
• categories and tags: metadata labels used to organize content by topic
• author: the author or creator of the content
• date: the date the content was published or last updated
• relatedPosts: other content items that are related or recommended based on similar topics or tags

Additional fields may be added or customized by modifying the Gatsby configuration or extending existing data sources.