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# Sharing your book
## Publishing
HTML books can be published online, see: https://bookdown.org/yihui/bookdown/publishing.html
## 404 pages
By default, users will be directed to a 404 page if they try to access a webpage that cannot be found. If you'd like to customize your 404 page instead of using the default, you may add either a `_404.Rmd` or `_404.md` file to your project root and use code and/or Markdown syntax.
## Metadata for sharing
Bookdown HTML books will provide HTML metadata for social sharing on platforms like Twitter, Facebook, and LinkedIn, using information you provide in the `index.Rmd` YAML. To setup, set the `url` for your book and the path to your `cover-image` file. Your book's `title` and `description` are also used.
<!--bs4_book:start-->
This `bs4_book` provides enhanced metadata for social sharing, so that each chapter shared will have a unique description, auto-generated based on the content.
Specify your book's source repository on GitHub as the `repo` in the `_output.yml` file, which allows users to view each chapter's source file or suggest an edit. Read more about the features of this output format here:
https://pkgs.rstudio.com/bookdown/reference/bs4_book.html
Or use:
```{r eval=FALSE}
?bookdown::bs4_book
```
<!--bs4_book:end-->
<!--gitbook:start-->
This `gitbook` uses the same social sharing data across all chapters in your book- all links shared will look the same.
Specify your book's source repository on GitHub using the `edit` key under the configuration options in the `_output.yml` file, which allows users to suggest an edit by linking to a chapter's source file.
Read more about the features of this output format here:
https://pkgs.rstudio.com/bookdown/reference/gitbook.html
Or use:
```{r eval=FALSE}
?bookdown::gitbook
```
<!--gitbook:end-->
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