fix some typo error

18_Day_Promises/18_day_promises.md

@@ -106,7 +106,7 @@ doSomething((err, result) => {
 
 ### Promise constructor
 
-We can create a promise using the Promise constructor. We can create a new promise using the key word new followed by the word Promise and followed by a parenthesis. Inside the parenthesis it it takes a callback function. The promise callback function has two parameters which are the *resolve* and *reject* functions.
+We can create a promise using the Promise constructor. We can create a new promise using the key word *new* followed by the word Promise and followed by a parenthesis. Inside the parenthesis it takes a callback function. The promise callback function has two parameters which are the *resolve* and *reject* functions.
 
 ```js
 // syntax
@@ -169,7 +169,7 @@ doPromise
 
 ## Fetch API
 
-The Fetch API provides an interface for fetching resources (including across the network). It will seem familiar to anyone who has used XMLHttpRequest, but the new API provides a more powerful and flexible feature set. In this challenge we will use fetch to request url and APIS. In addition to that let us see demonstrate use case of promises in accessing network resources using the fetch API.
+The Fetch API provides an interface for fetching resources (including across the network). It will seem familiar to anyone who has used XMLHttpRequest, but the new API provides a more powerful and flexible feature set. In this challenge we will use fetch to request url and APIs. In addition to that let us see demonstrate use case of promises in accessing network resources using the fetch API.
 
 ```js
 const url = 'https://restcountries.eu/rest/v2/all' // countries api
@@ -244,7 +244,7 @@ console.log('===== async and await')
 fetchData()
 ```
 
-🌕 You are real and you kept your promise and your reached to day 18. Keep your promise and settle the challenge with resolve. You are 18 steps a head to your way to greatness. Now do some exercises for your brain and for your muscle.
+🌕 You are real and you kept your promise and your reached to day 18. Keep your promise and settle the challenge with resolve. You are 18 steps ahead to your way to greatness. Now do some exercises for your brain and for your muscle.
 
 ## Exercises
 

19_Day_Closures/19_day_closures.md

@@ -80,7 +80,7 @@ console.log(innerFuncs.minusOne)
 
 ```sh
 1
-1
+0
 ```
 
 🌕 You are making progress. Maintain your momentum,  keep the good work.  Now do some exercises for your brain and for your muscle.