You create it by starting your markdown document with `---` followed by [[YAML]] encoded attributes and then ending with `---` again. Followed by the regular body of your document. This very page contains some frontmatter, click on it to see the underlying code.
*`tags` (`array of strings` or `string`): an alternative (and perhaps preferred) way to assign [[Tags]] to a page. There are various ways to define these, take your pick:
```yaml
tags: tag1, tag2 # with commas
tags: tag1 tag2 # with spaces
tags: "#tag1 #tag2" # with pound signs and quotes (you get completion)