public class CreateProjectSettings 

{
  //Create a new project using Pro's default settings
  var defaultProjectSettings = Project.GetDefaultProjectSettings();
  var project = Project.CreateAsync(defaultProjectSettings).Result;

  // Use project
}

{
  //Settings used to create a new project
  CreateProjectSettings projectSettings = new()
  {
    //Sets the name of the project that will be created
    // example: projectName =  @"C:\Data\MyProject1\MyProject1.aprx"
    Name = projectName
  };
  //Create the new project
  var project = Project.CreateAsync(projectSettings).Result;

  // Use project
}

{
  //Get Pro's default project settings.
  var defaultProjectSettings = Project.GetDefaultProjectSettings();
  //Create a new project using the default project settings
  var project = Project.CreateAsync(defaultProjectSettings).Result;

  // Use project
}

{
  //Settings used to create a new project
  CreateProjectSettings projectSettings = new()
  {
    //Sets the project's name
    Name = projectName,
    //Path where new project will be stored in
    LocationPath = @"C:\Data\NewProject",
    //Sets the project template that will be used to create the new project
    TemplatePath = @"C:\Data\MyProject1\CustomTemplate.aptx"
  };
  //Create the new project
  var project = Project.CreateAsync(projectSettings).Result;

  // Use project
}

{
  //Settings used to create a new project
  CreateProjectSettings proTemplateSettings = new()
  {
    //Sets the project's name
    Name = projectName,
    //Path where new project will be stored in
    LocationPath = @"C:\Data\NewProject",
    //Select which Pro template you like to use
    TemplateType = TemplateType.Catalog
    //TemplateType = TemplateType.LocalScene
    //TemplateType = TemplateType.GlobalScene
    //TemplateType = TemplateType.Map
  };
  //Create the new project
  var project = Project.CreateAsync(proTemplateSettings).Result;

  // Use project
}

{
  var projectFolder = Path.Combine(
      Environment.GetFolderPath(
          Environment.SpecialFolder.MyDocuments),
      @"ArcGIS\Projects");
  CreateProjectSettings ps = new()
  {
    Name = projectName,
    LocationPath = projectFolder,
    TemplatePath = templatePath
  };
  var project = Project.CreateAsync(ps).Result;
  //Use project;
}