Adding additional step to the checkout process NopCommerce V4.4

I want To Add additional step in a plugin to the checkout process to add a gift if the customer meet some rules.
I'm new to nopCommerce developpement , can anyone guide me through the right process with the best practice of nopCommerce plugin developpement to achieve this.
Thanks

You could override the checkout controller, and add an additional step, or use an Action filter to add an extra step where you want.

Thanks For the reply,
since i'm new to nopCommerce if ther's a small example of an action filter i'll be very greatful.
Thank you

This should give you an idea : https://www.majako.net/how-to-create-a-custom-action-filter-in-nopcommerce-v4/

Thank You So Much :)

It's Working like a charm :)
Thank you so much Again :)

No problem, glad you got sorted out :)

One thing I should say, is maybe post a small snippet of your code so that it may help others out in future :)

For sure m. First thing to do tomorrow :)

This is a snippet of My Code :
1- we should create our filter attribute that inherits From ActionFilterAttribute
public class WelcomeProgramAttribute : ActionFilterAttribute
    {
        private readonly IWelcomeGiftCalculationMethod _welcomeGiftCalculationMethod;

        public WelcomeProgramAttribute(IWelcomeGiftCalculationMethod welcomeGiftCalculationMethod)
        {
            _welcomeGiftCalculationMethod = welcomeGiftCalculationMethod;
        }

        public override async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            if (context.ActionDescriptor is ControllerActionDescriptor actionDescriptor && actionDescriptor.ControllerTypeInfo == typeof(ShoppingCartController)
                && actionDescriptor.ActionName.Equals("Cart"))
            {
                await _welcomeGiftCalculationMethod.CheckWelcomeGiftRules();
                await next();
            }
            else
            {
                await next();
            }
                

        }