Fixed grammar errors

Author: saadam1n

README.md

@@ -1,6 +1,6 @@
 # Minecraft Shader Programming
 
-This repository contains information and tutorials on how to write custom shaders for Minecraft use the Optifine mod. The tutorials start at the "Introduction" folder and then the "Tutorial N - ABCD" folders contain information on how to add a certain effect to your shader. The "Introduction" folder is not a shader pack, but the "Tutorial N - ABCD" is. For these tutorials the only requirement is a basic knowledge of graphics programming (you need to know everything up to the concept of rendering to a texture), although I plan to add another tutorial that explains all the basics in detail.
+This repository contains information and tutorials on how to write custom shaders for Minecraft using the Optifine mod. The tutorials start at the "Tutorial 0 - Introduction" folder and then the "Tutorial N - ABCD" folders contain information on how to add a certain effect to your shader. The "Tutorial 0 - Introduction" folder is not a shader pack, but the other tutorial folders are. For these tutorials the only requirement is a basic knowledge of graphics programming (you need to know everything up to the concept of rendering to a texture), although I plan to add another tutorial that explains all the basics in detail.
 
 I originally created this project because when I was learning how to write Minecraft shaders, there was little to no information I could find on how to write them. These set of tutorials aims to get rid of that issue for those who want to learn how to write a Minecraft shader.
 
@@ -10,7 +10,7 @@ If you want to contribute your own tutorial, create a pull request. One of my en
 
 First make sure you have Optifine installed and find your `shaderpacks` folder.
 
-If you have `git` installed, first move every shader in your `shaderpacks` folder to a temporary directory, so you can clone this repo into your `shaderpacks` folder and move everything back in.
+If you have `git` installed, first move every shader in your `shaderpacks` folder to a temporary directory, so you can clone this repository into your `shaderpacks` folder and move everything back in.
 
 If you do not have `git` installed, download this repo and move it's files into your `shaderpacks` folder.
 
@@ -23,4 +23,4 @@ If you do not have `git` installed, download this repo and move it's files into
 
 For questions and concerns regarding this tutorial, please contact me at:
 
-- Discrd: fuzdex#1811
+- Discord: fuzdex#1811