OpenGL, the thing that it is. Its used to make games down to the basic levels of programming. It uses older languages mostly c++ for its code.

Why Learn OpenGL instead of a game engine?

It is basic : Not easy but Basic, that means it gives you an understanding of the deep processes that go into rendering your favourite video games.
Its well known & cross platform : Sure you can go use your win32 Api or DirectX, but OpenGL is the cross platform well known easier alternative.
A game engine spoils you : Why I am glad I didn't use a game engine by DaFluffyPotato goes well over my point, A game engine does all those rendering processes for you. You don't get to learn a lot.
More Code : Game Engines like Unity are pure GUI stuff.
see this :-

Now this is OpenGL c++ :-

#include <glew.h>
#include <GLFW/glfw3.h>
#include <iostream>


int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;
    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(1920, 1080, "OpenGL", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);

    if (glewInit() != GLEW_OK)
        std::cout << "Error!" << std::endl;
    std::cout << glGetString(GL_VERSION) << std::endl;

    unsigned int buffer;
    float positions[6] = {
        -0.5f, -0.5f,
         0.0f, 0.5f,
         0.5f, -0.5f
    };

    glGenBuffers(1,&buffer);
    glBindBuffer(GL_ARRAY_BUFFER, buffer);
    glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float)  a=);
    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);


        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

I think you get the point now .

PS.Comment pls(If I got anything wrong or just casually)

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Why Learn OpenGL instead of a game engine?

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