Need help understanding Ai implementation in tic tac toe

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Good morning everyone, i have read a lot of the AI topics here concerning tic tac toe. Honestly, the more i read, the more confused i get. I understand how the minimax method works but i need help understanding how to write it in code. Please help and understand that i am a noob so you will have to break it down into the smallest chunks. I couldn't understand how to make computer smart so the tic tac toe game i made is two players
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  Put the code you need help with here.
#include <iostream>
#include <cstdlib>

using namespace std;

char spaces[9];
char emptySpaces[2];

char winnerCheck(int index, int increment)
{
    if (spaces[index + increment] == spaces[index] && spaces[index] == spaces[index + increment + increment])
        return spaces[index];
    else
        return ' ';
}

bool winnerDisplay()
{
    cout <<endl<<endl;
    if (winnerCheck(0, 1) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(0, 1) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(3, 1) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(3, 1) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(6, 1) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(6, 1) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(0, 3) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(0, 3) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(1, 3) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(1, 3) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(2, 3) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(2, 3) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(0, 4) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(0, 4) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
    if (winnerCheck(2, 2) == 'x')
        {
            cout <<"Player 1 is the winner";
            return true;
        }
    if (winnerCheck(2, 2) == 'o')
        {
            cout <<"Player 2 is the winner";
            return true;
        }
        return false;
}
void display()
{
    int space_index = 0;

    for (int i = 0; i < 2; i++)
    {
        for (int j = 0; j < 2; j++)
            cout <<spaces[space_index++]<<"|";
        cout <<spaces[space_index++]<<endl;
        cout <<"- - -"<<endl;
    }
    for (int i = 0; i < 2; i++)
        cout <<spaces[space_index++]<<"|";
    cout <<spaces[space_index];
}

int main()
{
    int player = 1;
    int player_determiner = 1;
    int choice = 49;
    int turns = 0;

    for (int i = 0; i < 9; i++)
        spaces[i] = ' ';

    cout <<"The spaces correspond to the numbers 1 - 9\n\n";

    display();

    do
    {
        do
        {
            if (player_determiner % 2 == 1)
                player = 1;
            if (player_determiner % 2 == 0)
                player = 2;
            cout <<"\n\nEnter the space you wish to occupy player "<<player<<": ";
            cin >>choice;
        }while(choice < 1 || choice > 9 || spaces[choice - 1] != ' ');
        turns++;
        player_determiner++;

        if (spaces[choice - 1] == ' ');
        {
            if (player == 1)
                spaces[choice - 1] = 'x';
            else if (player == 2)
                spaces[choice - 1] = 'o';
        }
        system("cls");
        display();
        if (winnerDisplay() == true)
            return 0;

    }while (turns < 9);

    cout <<"It's a tie"<<endl;


    return 0;
}
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