diff --git a/Debug/Window_practice.exe b/Debug/Window_practice.exe
index 64a5dcf..ca32b66 100644
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diff --git a/Debug/Window_practice.pdb b/Debug/Window_practice.pdb
index 069b753..31d9684 100644
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diff --git a/Window_practice/Debug/Main.obj b/Window_practice/Debug/Main.obj
index 8e814e9..80b5237 100644
Binary files a/Window_practice/Debug/Main.obj and b/Window_practice/Debug/Main.obj differ
diff --git a/Window_practice/Debug/Window_practice.ilk b/Window_practice/Debug/Window_practice.ilk
index af40635..6642736 100644
Binary files a/Window_practice/Debug/Window_practice.ilk and b/Window_practice/Debug/Window_practice.ilk differ
diff --git a/Window_practice/Debug/Window_practice.tlog/link.read.1.tlog b/Window_practice/Debug/Window_practice.tlog/link.read.1.tlog
index 6a526e9..d98202f 100644
Binary files a/Window_practice/Debug/Window_practice.tlog/link.read.1.tlog and b/Window_practice/Debug/Window_practice.tlog/link.read.1.tlog differ
diff --git a/Window_practice/Debug/vc142.idb b/Window_practice/Debug/vc142.idb
index bb3b281..bf69fe7 100644
Binary files a/Window_practice/Debug/vc142.idb and b/Window_practice/Debug/vc142.idb differ
diff --git a/Window_practice/Debug/vc142.pdb b/Window_practice/Debug/vc142.pdb
index 8f50eb9..f17e1ba 100644
Binary files a/Window_practice/Debug/vc142.pdb and b/Window_practice/Debug/vc142.pdb differ
diff --git a/Window_practice/src/Main.cpp b/Window_practice/src/Main.cpp
index 9cd0966..f290d48 100644
--- a/Window_practice/src/Main.cpp
+++ b/Window_practice/src/Main.cpp
@@ -2,6 +2,50 @@
 #include <GLFW/glfw3.h>
 #include <iostream>
 
+static unsigned int CompileShader(unsigned int type, const std::string& source) {
+    unsigned int id = glCreateShader(type);
+    const char* src = source.c_str();
+    glShaderSource(id, 1, &src, nullptr);
+    glCompileShader(id);
+
+    //Error handling
+    int result;
+    glGetShaderiv(id, GL_COMPILE_STATUS, &result);
+
+    if (result == GL_FALSE) {
+        int length;
+        glGetShaderiv(id, GL_INFO_LOG_LENGTH, &length);
+        char* message = (char*)_malloca(length * sizeof(char)); //_malloca is more secure than alloca
+        glGetShaderInfoLog(id, length, &length, message);
+        
+        std::cout << "Failed to compile " << 
+            (type == GL_VERTEX_SHADER ? "vertex" : "fragment") << " shader" << std::endl;
+        std::cout << message << std::endl;
+        
+        glDeleteShader(id);
+       
+        return 0;
+    }
+
+    return id;
+}
+
+static unsigned int CreateShader(const std::string& vertexShader, const std::string& fragmentShader) {
+    unsigned int program = glCreateProgram();
+    unsigned int vs = CompileShader(GL_VERTEX_SHADER, vertexShader);
+    unsigned int fs = CompileShader(GL_FRAGMENT_SHADER, fragmentShader);
+
+    glAttachShader(program, vs);
+    glAttachShader(program, fs);
+    glLinkProgram(program);
+    glValidateProgram(program);
+
+    glDeleteShader(vs);
+    glDeleteShader(fs);
+
+    return program;
+}
+
 int main(void){
     // GLFW init
     if (!glfwInit()) {
@@ -45,6 +89,28 @@ int main(void){
     glEnableVertexAttribArray(0);
     glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 2, 0);
 
+    std::string vertexShader =
+        "#version 330 core\n"
+        "\n"
+        "layout(location = 0) in vec4 position;\n"
+        "\n"
+        "void main(){\n"
+        "   gl_Position = position;\n"
+        "}\n";
+
+    std::string fragmentShader =
+        "#version 330 core\n"
+        "\n"
+        "layout(location = 0) out vec4 color;\n"
+        "\n"
+        "void main(){\n"
+        "   color = vec4(1.0, 0.0, 0.0, 1.0);\n"
+        "}\n";
+
+
+    unsigned int shader = CreateShader(vertexShader, fragmentShader);
+    glUseProgram(shader);
+
     glBindBuffer(GL_ARRAY_BUFFER, 0); //unbinding the buffer
 
    //Main loop
@@ -61,6 +127,8 @@ int main(void){
         glfwPollEvents();
     }
 
+    glDeleteProgram(shader);
+
     glfwTerminate();
     return 0;
 }
\ No newline at end of file