Click the one you want to insert in the text. If your document has many headings, it's a good idea to add a table of contents in case it will be accessed outside Google Docs, for instance, if you ...

The strikethrough and checklist functions in Google Docs can be particularly handy when organizing tasks online. Here are keyboard shortcuts for them.

The strikethrough and checklist functions in Google Docs can be particularly handy when organizing tasks online. Here are keyboard shortcuts for them.