diff --git a/70_classroom-overview.Rmd b/60_classroom-overview.Rmd
similarity index 100%
rename from 70_classroom-overview.Rmd
rename to 60_classroom-overview.Rmd
diff --git a/50_more-content.Rmd b/70_more-content.Rmd
similarity index 99%
rename from 50_more-content.Rmd
rename to 70_more-content.Rmd
index 337771fe..2aad6225 100644
--- a/50_more-content.Rmd
+++ b/70_more-content.Rmd
@@ -1,4 +1,4 @@
-# (PART) More {-} 
+# (PART) Meta {-} 
 
 # Notes
 
diff --git a/79_bookdown-cheat-sheet.Rmd b/79_bookdown-cheat-sheet.Rmd
new file mode 100644
index 00000000..18151223
--- /dev/null
+++ b/79_bookdown-cheat-sheet.Rmd
@@ -0,0 +1,48 @@
+# Bookdown cheat sheet
+
+Here's where I park _little_ *examples* **for myself** about bookdown mechanics that I keep forgetting.
+
+## Heading blah blah
+
+## About labelling things {#id-example}
+
+You can label chapter and section titles using `{#label}` after them, e.g., we can reference Section \@ref(id-example). If you do not manually label them, there will be automatic labels anyway, e.g., this reference to the unlabelled heading \@ref(heading-blah-blah) uses the automatically generated label `\@ref(heading-blah-blah)`.
+
+## Cross-references
+
+Add an explicit label by adding `{#label}` to the end of the section header. If you know you're going to refer to something, this is probably a good idea.
+
+To refer to in a chapter- or section-number-y way, use `\@ref(label)`.
+
+  * `\@ref(install-git)` example: In chapter \@ref(install-git) we explain how to install Git.
+
+If you are happy with the section header as the link text, use it inside a single set of square brackets:
+
+  * `[A picture is worth a thousand words]`: example "A picture is worth a thousand words" via [A picture is worth a thousand words]
+
+There are two ways to specify custom link text:
+
+  * `[link text][Section header text]`, e.g., "pic = 1000 words" via [pic = 1000 words][A picture is worth a thousand words]
+  * `[link text](#label)`, e.g., "RStudio, meet Git" via [RStudio, meet Git](#rstudio-see-git)
+  
+The Pandoc documentation provides more details on automatic section IDs and implicit header references.
+
+## Figures, tables, citations
+
+Figures and tables with captions will be placed in `figure` and `table` environments, respectively.
+
+```{r nice-fig, fig.cap='Here is a nice figure!', out.width='80%', fig.asp=.75, fig.align='center'}
+par(mar = c(4, 4, .1, .1))
+plot(pressure, type = 'b', pch = 19)
+```
+
+Reference a figure by its code chunk label with the `fig:` prefix, e.g., see Figure \@ref(fig:nice-fig). Similarly, you can reference tables generated from `knitr::kable()`, e.g., see Table \@ref(tab:nice-tab).
+
+```{r nice-tab, tidy=FALSE}
+knitr::kable(
+  head(iris, 20), caption = 'Here is a nice table!',
+  booktabs = TRUE
+)
+```
+
+You can write citations, too. For example, we are using the **bookdown** package [@R-bookdown] in this sample book, which was built on top of R Markdown and **knitr** [@xie2015].
diff --git a/80_shell.Rmd b/80_shell.Rmd
index fe78d00c..85d7c3ff 100644
--- a/80_shell.Rmd
+++ b/80_shell.Rmd
@@ -1,4 +1,4 @@
-# (APPENDIX) Appendix {-} 
+# (APPENDIX) Appendix {-}
 
 # The shell {#shell}
 
diff --git a/99_sample.Rmd b/99_sample.Rmd
deleted file mode 100644
index e86fcb3a..00000000
--- a/99_sample.Rmd
+++ /dev/null
@@ -1,29 +0,0 @@
-# Applications
-
-Some _significant_ applications are demonstrated in this chapter.
-
-## Example one
-
-## Example two
-
-# Introduction {#intro}
-
-You can label chapter and section titles using `{#label}` after them, e.g., we can reference Chapter \@ref(intro). If you do not manually label them, there will be automatic labels anyway, e.g., Chapter \@ref(methods).
-
-Figures and tables with captions will be placed in `figure` and `table` environments, respectively.
-
-```{r nice-fig, fig.cap='Here is a nice figure!', out.width='80%', fig.asp=.75, fig.align='center'}
-par(mar = c(4, 4, .1, .1))
-plot(pressure, type = 'b', pch = 19)
-```
-
-Reference a figure by its code chunk label with the `fig:` prefix, e.g., see Figure \@ref(fig:nice-fig). Similarly, you can reference tables generated from `knitr::kable()`, e.g., see Table \@ref(tab:nice-tab).
-
-```{r nice-tab, tidy=FALSE}
-knitr::kable(
-  head(iris, 20), caption = 'Here is a nice table!',
-  booktabs = TRUE
-)
-```
-
-You can write citations, too. For example, we are using the **bookdown** package [@R-bookdown] in this sample book, which was built on top of R Markdown and **knitr** [@xie2015].
diff --git a/_bookdown.yml b/_bookdown.yml
index c943d56f..d43ad8a5 100644
--- a/_bookdown.yml
+++ b/_bookdown.yml
@@ -37,9 +37,10 @@ rmd_files: [
   "44_prompt-practice-resets.Rmd",
   "45_prompt-search-github.Rmd",
 
-  "50_more-content.Rmd",
+  "60_classroom-overview.Rmd",
 
-  "70_classroom-overview.Rmd",
+  "70_more-content.Rmd",
+  "79_bookdown-cheat-sheet.Rmd",
 
   "80_shell.Rmd",