The Title Serial Number plugin allows users to automatically add serial numbers to markdown headers in Obsidian. Users can configure which header levels (like H2, H3, etc.) should have serial numbers applied, ensuring that only selected headers are numbered. The plugin provides two main commands: 'Set Serial Number For Title' and 'Clear Serial Number For Title', offering flexibility in managing numbering across notes. The numbering follows a logical, nested format, creating a clear hierarchy for headers. This tool is useful for structuring large documents, reports, and notes where an organized, numbered format is required.