How can I create folder new folder and upload new folder in SharePoint Document Library using Graph API in C#?

I want to create a folder and also If I have one folder and in that folder I have 5 files. so I need to upload that folder with that all 5 files.

using Azure.Identity;
using Microsoft.Graph;
using Microsoft.Graph.Models;
using Microsoft.Graph.Sites.GetAllSites;

namespace UploadFiles;
public class GraphHandler
{
    public GraphServiceClient GraphClient { get; set; }

    public GraphHandler(string tenantId, string clientId, string clienSecret)
    {
        GraphClient = CreateGraphClient(tenantId, clientId, clienSecret);
    }

    public GraphServiceClient CreateGraphClient(string tenantId, string clientId, string clientSecret)
    {
        var option = new TokenCredentialOptions
        {
            AuthorityHost = AzureAuthorityHosts.AzurePublicCloud
        };

        var clientSecretCredentials = new ClientSecretCredential(tenantId, clientId, clientSecret, option);
        var scope = new[] { "https://graph.microsoft.com/.default" };

        return new GraphServiceClient(clientSecretCredentials, scope);
    }
}

I am trying to using Graph handler that i mentioned above.

how can I do this?