diff --git a/ebook/12_classes.md b/ebook/12_classes.md
index c7838bc..73200f1 100644
--- a/ebook/12_classes.md
+++ b/ebook/12_classes.md
@@ -52,7 +52,7 @@ const person = class Person {
 }
 ```
 
->Remember: class declaration (and expression) and **not hoisted** which means that unless you want to get a **ReferenceError** you need to declare your class before you access it.
+>Remember: class declaration (and expression) are **not hoisted** which means that unless you want to get a **ReferenceError** you need to declare your class before you access it.
 
 Let's start creating our first `Class`.
 
diff --git a/ebook/17_ES7_incudes-and-exponential-operator.md b/ebook/17_ES7_incudes-and-exponential-operator.md
index b9aa7b8..df23996 100644
--- a/ebook/17_ES7_incudes-and-exponential-operator.md
+++ b/ebook/17_ES7_incudes-and-exponential-operator.md
@@ -67,7 +67,7 @@ Now with the new exponential operator we can do this:
 2**2;
 // 4
 2**3;
-// 4
+// 8
 ```
 
 It will get pretty useful when combining multiple operations like in this example:
diff --git a/ebook/19_ES8_async-and-await.md b/ebook/19_ES8_async-and-await.md
index 192451f..1d69086 100644
--- a/ebook/19_ES8_async-and-await.md
+++ b/ebook/19_ES8_async-and-await.md
@@ -111,7 +111,7 @@ Let's break down what we just did:
 - the keyword will tell JavaScript to always return a promise
 - if we specify to `return <non-promise>` it will return a value wrapped inside a promise
 - the `await` keyword only works inside an `async` function.
-- as the name implies, `await` will tell JavaScript to wait until the promie returns its result
+- as the name implies, `await` will tell JavaScript to wait until the promise returns its result
 
 Let's see what happens if we try to use `await` outside an `async` function
 
@@ -166,4 +166,4 @@ asyncFunc();
 
 asyncFunc().catch(console.log);
 // TypeError: Failed to fetch
-```
\ No newline at end of file
+```
diff --git a/ebook/20_ES9_what-is-coming.md b/ebook/20_ES9_what-is-coming.md
index a255b8b..da59595 100644
--- a/ebook/20_ES9_what-is-coming.md
+++ b/ebook/20_ES9_what-is-coming.md
@@ -5,7 +5,7 @@ You can find the list on [github](https://github.com/tc39/proposals/blob/master/
 
 &nbsp;
 
-## Rest / Spred for objects
+## Rest / Spread for objects
  
 Now we can use the rest/spread syntax for objects, let's look at how:
 
@@ -142,4 +142,4 @@ regexGreekSymbol.test('π');
 
 When using *tagged* template literals the restriction on escape sequences are removed.
 
-You can read more [here.](https://tc39.github.io/proposal-template-literal-revision/#sec-template-literals)
\ No newline at end of file
+You can read more [here.](https://tc39.github.io/proposal-template-literal-revision/#sec-template-literals)