How to start into Game Hacking

#include <iostream>
#include <windows.h>
#include <string>
#include <cstdio>




using namespace std;

int main()
{
	system("color 0A");
	cout << "Call of Duty : Modern Warfare 2 Steam Tool - Made by MW2TopTenWORLD!\n" << endl;
	cout << "Research made for Steam version of the game \"1.2.208\"\n" << endl;
	cout << "Research by : MW2TopTenWORLD\n" << endl;
	cout << "There will be no updates to this program! This will only be a stats tool!!\n" << endl;
	LPCWSTR ProcessName222 = L"Modern Warfare 2";
	
	HWND hwnd = FindWindow(0, ProcessName222);
	if (hwnd == 0)
	{
		cout << "Call of Duty : Modern Warfare 2 was NOT Found!! Make sure the game is opened before opening this tool...\nThe tool will exit so you can Open the game...";
		std::getchar();
	}
	else
	{
		DWORD process_ID;
		GetWindowThreadProcessId(hwnd, &process_ID);
		HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, process_ID);
		cout << "Call of Duty : Modern Warfare 2 Was FOUND!... Welcome to my tool..." << endl;
		system("Pause");
		int Option;
		cout << "Pick what you want to mod...\nType 1 for XP\nType 2 for Score\nType 3 for Wins\nType 4 for Losses\nType 5 for Ties\nType 6 for Win Streak\nType 7 for Kills\nType 8 for Headshots\nType 9 for Assists\nType 10 for Killstreak\nType 11 for Deaths\nType 12 for Prestige\nType 13 for INSANE STATS!\n";
		cout << "Type what you want : ";
		
		cin >> Option;
		cin.ignore();
		if (Option > 13)
		{
			cout << "There is no option higher than 13.... Dumbass!" << endl;
		}
		else
		{
			if (Option == 1){
				cout << "What do you want to set your XP as?" << endl;
				cout << "Type what XP you want : ";
				int XP;
				cin >> XP;
				cin.ignore();
				
				DWORD newdatasize = sizeof(XP);
				if (WriteProcessMemory(hProcess, (LPVOID)0x01B2C89C, &XP, newdatasize, NULL))
				{
					cout << "The XP Has been sucessfully written as : " + XP << endl;
				}
				else
				{
					cout << "An error has ocurred and the XP could not be written!!" << endl;
				}
				CloseHandle(hProcess);
				
			}
		}
		cin.get();

	}
	return 0;
}

HANDLE WINAPI GetCurrentProcess(void);

DWORD WINAPI GetCurrentProcessId(void);

BOOL WINAPI WriteProcessMemory(
	_In_   HANDLE hProcess,
	_In_   LPVOID lpBaseAddress,
	_In_   LPCVOID lpBuffer,
	_In_   SIZE_T nSize,
	_Out_  SIZE_T *lpNumberOfBytesWritten
	);

HANDLE WINAPI OpenProcess(
	_In_  DWORD dwDesiredAccess,
	_In_  BOOL bInheritHandle,
	_In_  DWORD dwProcessId
	);

BOOL IsProcessRunning(DWORD pid)
{
	HANDLE process = OpenProcess(SYNCHRONIZE, FALSE, pid);
	DWORD ret = WaitForSingleObject(process, 0);
	CloseHandle(process);
	return ret == WAIT_TIMEOUT;
}

#include <iostream>
#include <Windows.h>
#include <string>
#include <cstdio>




using namespace std;

int main()
{
	system("color 0A");
	LPCWSTR ProcessName222 = L"Calculator";
	HWND hwnd = FindWindowW(0, ProcessName222);
	if (hwnd == 0)
	{
		cout << "Call of Duty : Modern Warfare 2 was NOT Found!! Make sure the game is opened before opening this tool...\nThe tool will exit so you can Open the game...";
		std::getchar();
	}
	else
	{
		DWORD process_ID;
		GetWindowThreadProcessId(hwnd, &process_ID);
		HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, process_ID);
		cout << ProcessName222 << " FOUND!... Welcome to my tool..." << endl;
		system("Pause");
		int Option;
		cout << "Pick what you want to mod...\nType 1 for XP\nType 2 for Score\nType 3 for Wins\nType 4 for Losses\nType 5 for Ties\nType 6 for Win Streak\nType 7 for Kills\nType 8 for Headshots\nType 9 for Assists\nType 10 for Killstreak\nType 11 for Deaths\nType 12 for Prestige\nType 13 for INSANE STATS!\n";
		cout << "Type what you want : ";
		
		cin >> Option;
		cin.ignore();
		if (Option > 13)
		{
			cout << "There is no option higher than 13.... Dumbass!" << endl;
		}
		else
		{
			if (Option == 1){
				cout << "What do you want to set your XP at?" << endl;
				cout << "Type what XP you want : ";
				int XP;
				cin >> XP;
				cin.ignore();
				
				DWORD newdatasize = sizeof(XP);
				cout <<"About to call WPM()...\n\n" << endl;
				cout <<"sizeof(SIZE_T) = " << sizeof(SIZE_T) << "\n";
				cout <<"sizeof(void*) = " << sizeof(void*) << "\n";
				cout <<"sizeof(DWORD) = " << sizeof(DWORD) << "\n";
				cout <<"sizeof(XP-int) = " << sizeof(XP) << "\n" << endl;
				if (WriteProcessMemory(hProcess, (LPVOID)0x004D815C, &XP, newdatasize, NULL))
				{
					cout << "The XP Has been sucessfully written as : " << XP << endl;
				}
				else
				{
					cout << "An error has ocurred and the XP could not be written!!" << endl;
				}
				CloseHandle(hProcess);
			}
		}
		cin.get();
	}
	return 0;
}

HANDLE WINAPI GetCurrentProcess(void);

DWORD WINAPI GetCurrentProcessId(void);

BOOL  WINAPI WriteProcessMemory(
	_In_   HANDLE hProcess,
	_In_   LPVOID lpBaseAddress,
	_In_   LPCVOID lpBuffer,
	_In_   SIZE_T nSize,
	_Out_  SIZE_T *lpNumberOfBytesWritten
	);
	
HANDLE WINAPI  OpenProcess(
	_In_  DWORD dwDesiredAccess,
	_In_  BOOL bInheritHandle,
	_In_  DWORD dwProcessId
	);
	
BOOL IsProcessRunning(DWORD pid)
{
	HANDLE process = OpenProcess(SYNCHRONIZE, FALSE, pid);
	DWORD ret = WaitForSingleObject(process, 0);
	CloseHandle(process);
	return ret == WAIT_TIMEOUT;
}