How to use Properties
Properties allow you to organize information about a note. To keep them consistent for later queries, it’s a good practice to start with a predefined set of properties in your templates. Properties can also be used in conjunction with community plugins that can do useful things with your structured data.
The diagram shows all the properties from my templates on one page. If you want to use the community plugin “Book Search”, the given set of properties is mandatory. The highlighted properties (yellow) are used as basic metadata in all given templates.
If this is your starting point with templates and properties, feel free to improve this structure and adapt it to your own needs.
More about: Properties - Obsidian Help