Fix a few typos

course_notes.md

@@ -16,16 +16,16 @@ In order to do that, you'll need to bring some equipment. Here's a list:
 
 ## A Laptop
 
-A laptop. It would be great if you could have a Unix-like operating
-system installed (Linux or OSX). The examples **should** all work on
-Windows, but I can't guarantee it. If you have a Windows laptop, then
-a good workaround is to install something like VirtualBox and set-up a
-Linux VM. 
+It would be great if you could have a Unix-like operating system
+installed (Linux or OSX). The examples **should** all work on Windows,
+but I can't guarantee it. If you have a Windows laptop, then a good
+workaround is to install something like VirtualBox and set-up a Linux
+VM. 
 
 ## A Database
 
 The application that we write will have a database at its backend.
-I'll be working with MySQL (actually MariaDB(, but if you're happier
+I'll be working with MySQL (actually MariaDB), but if you're happier
 with Postgres or SQLite they should both work fine too. I'll supply
 table definitions and some basic data, but if you're using something
 other than MySQL it's possible that those files will need some light
@@ -34,7 +34,7 @@ editing before you can use them.
 ## A Web Server or Two
 
 One advantage of modern Perl web applications is that their
-implementation is completely separated from their deployment
+implementation is completely separate from their deployment
 environment. In order to demonstrate that it would be nice if if you
 had a couple of deployment environments installed on you laptop. The
 obvious choice is Apache, which means that we can try out both CGI and
@@ -73,7 +73,7 @@ installed using `yum`, `apt-get` or whatever similar command you use.
 
 On other operating systems (or if you want more control over the
 installation process) you will need to install the modules manually. I
-recommend using `cpan` to install App::cpanminus and to use `cpanm`
+recommend using `cpan` to install App::cpanminus and using `cpanm`
 from then on.
 
 The modules you will need are as follows:
@@ -112,4 +112,4 @@ If you have any other questions, please contact me on:
 
 * dave@perlhacks.com
 * @davorg
-* [Perl Hacks](http://perlhacks.com/) - my Perl blog
+* Perl Hacks (http://perlhacks.com/) - my Perl blog