redo the section readmes

exercises/functions/REAMDE.md

@@ -1 +1,7 @@
-For this exercise check out the chapter [Functions](https://doc.rust-lang.org/book/2018-edition/ch03-03-how-functions-work.html) of the Rust Book.
+### Functions
+
+Here, you'll learn how to write functions and how Rust's compiler can trace things way back.
+
+#### Book Sections
+
+- [How Functions Work](https://doc.rust-lang.org/stable/book/ch03-03-how-functions-work.html)

exercises/if/README.md

@@ -0,0 +1,7 @@
+### If
+
+`if`, the most basic type of control flow, is what you'll learn here.
+
+#### Book Sections
+
+- [Control Flow - if expressions](https://doc.rust-lang.org/stable/book/ch03-05-control-flow.html#if-expressions)

exercises/if/REAMDE.md

@@ -1 +0,0 @@
-For this exercise check out the chapter [If](https://doc.rust-lang.org/book/2018-edition/ch03-05-control-flow.html?highlight=control,fl#control-flow) of the Rust Book.

exercises/macros/README.md

@@ -1,2 +1,10 @@
-For this exercise check out the section [Macros](https://doc.rust-lang.org/book/2018-edition/macros.html) and the chapter
-[Macros Appendix](https://doc.rust-lang.org/book/2018-edition/appendix-04-macros.html) of the Rust Book and [The Little Book of Rust Macros](https://danielkeep.github.io/tlborm/book/index.html). 
+### Macros
+
+Rust's macro system is very powerful, but also kind of difficult to wrap your
+head around. We're not going to teach you how to write your own fully-featured
+modules, instead we'll show you how to use and create them.
+
+#### Book Sections
+
+- [Macros](https://doc.rust-lang.org/stable/book/ch19-06-macros.html)
+- [The Little Book of Rust Macros](https://danielkeep.github.io/tlborm/book/index.html)

exercises/modules/README.md

@@ -1 +1,7 @@
-For this exercise check out the [Modules](https://doc.rust-lang.org/book/2018-edition/ch07-01-mod-and-the-filesystem.html) chapter of the Rust Book.
+### Modules
+
+In this section we'll give you an introduction to Rust's module system.
+
+#### Book Sections
+
+- [The Module System](https://doc.rust-lang.org/stable/book/ch07-02-modules-and-use-to-control-scope-and-privacy.html)

exercises/move_semantics/README.md

@@ -1,7 +1,10 @@
-These exercises are adapted from [pnkfelix](https://github.com/rustlings/rustlings/blob/master)'s [Rust Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- Thank you Felix!!!
+### Move Semantics
 
-For this exercise check out the chapters:
-- [Ownership](https://doc.rust-lang.org/book/2018-edition/ch04-01-what-is-ownership.html)
-- [Reference and borrowing](https://doc.rust-lang.org/book/2018-edition/ch04-02-references-and-borrowing.html)
+These exercises are adapted from [pnkfelix](https://github.com/pnkfelix)'s [Rust Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- Thank you Felix!!!
 
-of the Rust Book.
+#### Book Sections
+
+For this section, the book links are especially important.
+
+- [Ownership](https://doc.rust-lang.org/stable/book/ch04-01-what-is-ownership.html)
+- [Reference and borrowing](https://doc.rust-lang.org/stable/book/ch04-02-references-and-borrowing.html)

exercises/primitive_types/README.md

@@ -1 +1,8 @@
-For this exercise check out the chapter [Data Types](https://doc.rust-lang.org/book/2018-edition/ch03-02-data-types.html) of the Rust Book.
+### Primitive Types
+
+Rust has a couple of basic types that are directly implemented into the
+compiler. In this section, we'll go through the most important ones.
+
+#### Book Sections
+
+- [Data Types](https://doc.rust-lang.org/stable/book/ch03-02-data-types.html)

exercises/strings/REAMDE.md

@@ -1 +1,9 @@
-For this exercise check out the chapter [Strings](https://doc.rust-lang.org/book/2018-edition/ch08-02-strings.html) of the Rust Book.
+### Strings
+
+Rust has two string types, a string slice (`&str`) and an owned string (`String`).
+We're not going to dictate when you should use which one, but we'll show you how
+to identify and create them, as well as use them.
+
+#### Book Sections
+
+- [Strings](https://doc.rust-lang.org/stable/book/ch08-02-strings.html)

exercises/tests/README.md

@@ -1,3 +1,7 @@
+### Tests
+
 Going out of order from the book to cover tests -- many of the following exercises will ask you to make tests pass!
 
-For this exercise check out the section [How to Write Tests](https://doc.rust-lang.org/book/2018-edition/ch11-01-writing-tests.html) of the Rust Book.
+#### Book Sections
+
+- [Writing Tests](https://doc.rust-lang.org/stable/book/ch11-01-writing-tests.html)

exercises/variables/README.md

@@ -1 +1,7 @@
-For this exercise checkout the section [Variables and Mutability](https://doc.rust-lang.org/book/2018-edition/ch03-01-variables-and-mutability.html) of the Rust Book.
+### Variables
+
+Here you'll learn about simple variables.
+
+#### Book Sections
+
+- [Variables and Mutability](https://doc.rust-lang.org/stable/book/ch03-01-variables-and-mutability.html)