Update en/01.2.md - Fix typos

en/01.2.md

@@ -2,7 +2,7 @@
 
 ## $GOPATH
 
-Go commands all rely on one important environment variable called $GOPATH. Notice that this is not the $GOROOT variable where Go is installed. This variable points to the workspace of Go on your computer (I use this path on my computer; if you don't have the same directory structure, please replace by yourself).
+Go commands all rely on one important environment variable called $GOPATH. Notice that this is not the $GOROOT variable where Go is installed. This variable points to the workspace of Go on your computer (I use this path on my computer; if you don't have the same directory structure, please replace it by yourself).
 
 In Unix-like systems, the variable should be used like this:
 	
@@ -22,7 +22,7 @@ In this book, I use `mygo` as my only path in $GOPATH.
 
 ## Package directory
 
-Create package source files and folders like `$GOPATH/src/mymath/sqrt.go` (`mymath` is the package name) ( ***Author uses `mymath` as his package name, and same name for the folder where contains package source files***)
+Create package source files and folders like `$GOPATH/src/mymath/sqrt.go` (`mymath` is the package name) ( ***Author uses `mymath` as his package name, and the same name for the folder that contains the package source files***)
 
 Every time you create a package, you should create a new folder in the `src` directory. Folder names are usually the same as the package that you are going to use. You can have multi-level directories if you want to. For example, if you create the directory `$GOPATH/src/github.com/astaxie/beedb`, then the package path would be `github.com/astaxie/beedb`. The package name will be the last directory in your path, which is `beedb` in this case.
 
@@ -31,7 +31,7 @@ Execute following commands. ( ***Now author goes back to talk examples*** )
 	cd $GOPATH/src
 	mkdir mymath
 	
-Create a new file called `sqrt.go`, type following content to your file.
+Create a new file called `sqrt.go`, type the following content to your file.
 
 	// Source code of $GOPATH/src/mymath/sqrt.go
 	package mymath
@@ -44,7 +44,7 @@ Create a new file called `sqrt.go`, type following content to your file.
 		return z
 	}
 	
-Now my package directory has been created and its code has been written. I recommend that you use the same name for your packages as their corresponding directories, and that the directories contain all of the package source files.
+Now my package directory has been created and it's code has been written. I recommend that you use the same name for your packages as their corresponding directories, and that the directories contain all of the package source files.
 
 ## Compile packages
 
@@ -70,7 +70,7 @@ Create a new application package called `mathapp`.
 	cd mathapp
 	vim main.go
 	
-code 
+Write the following content to main.go.
 
 	//$GOPATH/src/mathapp/main.go source code.
 	package main