The Frontmatter Tag Suggest plugin enhances the tagging experience in Obsidian by providing autocompletion for tags within YAML frontmatter. It simplifies the process of adding tags by displaying an autocomplete menu for lines beginning with tags: or tag:. Unlike the default Obsidian behavior, which requires a # character for tag autocomplete, this plugin ensures that tags are properly formatted for YAML without the need to manually edit out the #.