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What is metadata?
Each entry also includes a separate metadata content. Metadata is used to further customize the look and display of your entries to a finer degree than you can through just Markdown.
Metadata includes options to customize how your entries look when shared to other platforms, as well as to customize how your entries render when viewed.
All option names can either be in all lowercase, or all uppercase. While option values for String type metadata options should be encased in double quotes, that will be done for you if you leave them out. This is included just for compatibility.
Metadata options go in the "Metadata" tab in the entry editor page. Each option should be on a new line, and should be formatted as NAME = value. If you're familiar with TOML, you should be comfortable with metadata formatting.
You can view a list of all options and what they do here.