Fragment Shader doesn't seem to output any colors

I recently decided to start Learning OpenGL and got myself a book about OpenGL Core 3.3. The book is generally about C++.

So, after looking for a bit, I found a library in a language I was better in which provided almost the same functionality: lwjgl.
I managed to draw several shapes with basic vertex and fragment shaders. When I tried getting the Fragment shader to output a color other than white though, it didn't affect anything; The shapes are still getting rendered in white.

My question is if something is wrong with the shader itself or if i didn't load it up correctly.
The code in my Main.java(The ShaderLoader is simply a class that loads .vs(vertex shader) and .fs(fragment shader) files):

 try {
			String vshaderSource, fshaderSource;
			vshaderSource = ShaderLoader.loadShaderSource(vertexShader, Path.of("main.vs"));
			glShaderSource(vertexShader, vshaderSource);
			fshaderSource = ShaderLoader.loadShaderSource(fragmentShader, Path.of("main.fs"));
			
			glShaderSource(fragmentShader, fshaderSource);
		} catch (IOException e) {
			log.severe(String.format("Loading of Shaders failed due to IOException: %s", e.getMessage()));
			return;
		} 
		glCompileShader(vertexShader);
		int success = glGetShaderi(vertexShader, GL_COMPILE_STATUS);
		String infoLog;
		if(success == 0) {
			infoLog = glGetShaderInfoLog(vertexShader);
			log.severe("Shader Compilation failed: " + infoLog);
		}
		glCompileShader(fragmentShader);
		success = glGetShaderi(fragmentShader, GL_COMPILE_STATUS);
		if(success == 0) {
			infoLog = glGetShaderInfoLog(fragmentShader);
			log.severe("Shader Compilation failed:" + infoLog);
		}
		int shaderProgram = glCreateProgram();
		glAttachShader(shaderProgram, vertexShader);
		glAttachShader(shaderProgram, fragmentShader);
		glDeleteShader(vertexShader);
		glDeleteShader(fragmentShader);
        glUseProgram(shaderProgram);
        //In the rendering Loop
        glUseProgram(shaderProgram);
		        
		glBindVertexArray(VAO); 

	    glUseProgram(shaderProgram);

		glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);

Vertex Shader main.vs:

#version 330 core
layout (location = 0) in vec3 aPos;

out vec4 vertexColor;

void main()
{
    gl_Position = vec4(aPos, 1.0);
    vertexColor = vec4(0.5, 0.0, 0.0, 1);
}

fragment shader main.fs:

#version 330 core
   in vec4 vertexColor;
   out vec4 FragColor;
   void main()
    {
       FragColor = vertexColor;
    };

You are not glLinkProgram the shader program. So, between attaching the shaders to the program and detaching them again, you should add glLinkProgram(shaderProgram).