Image not rendering .bmp image C++ SDL

I am learning SDL, and I am trying to render a .bmp image, but it just displays a black screen. Here is the code:

#include <SDL.h>
#include "engine.cpp"
#include <iostream>

using namespace std;

int main(int argc, char* argv[]) {
    //Init image's pointers
    bool quit = false;
    //Render a window
    SDL_Event event;
    SDL_Init(SDL_INIT_EVERYTHING);

    SDL_Surface *imageSurface = NULL;
    SDL_Surface* windowSurface = NULL;

    SDL_Window* window = SDL_CreateWindow("SDL2 Displaying Image", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
    SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, 0);

    windowSurface = SDL_GetWindowSurface(window);
    imageSurface = SDL_LoadBMP("hello.bmp");



    while (!quit) {
        SDL_WaitEvent(&event);
        switch (event.type) {
        case SDL_QUIT:
            quit = true;
            break;
        }
    }

    SDL_BlitSurface(imageSurface, NULL, windowSurface, NULL);

    SDL_UpdateWindowSurface(window);
    
    SDL_Delay(2000);
    SDL_Quit();
    return 0;
}

What I am trying to do is render a .bmp image. I am currently only bug testing, so please don't roast me for not using SDL_Quit(). I have looked at any solution to this issue I could find, and none of them have worked. Please help!

You told the computer to wait until you quit the program, and then draw the picture.

You probably want to draw the picture straight away, before you quit the program.