How do you know which model to use when programatically adding content?

Questions
1

Good day forum!

I’ve been importing content for years now and have always struggled to find out the right strongly typed model to use for the job.

As a simple example, the Link object can be imported like below:

Link linkObj = new Link() { Url = "/", Target = "_blank" };
treeNode.SetValue(nameof(StandardPage.Link), JsonSerializer.Serialize(linkObj));

The issue comes with more complex types. Take a property with an editor of Umbraco.MediaPicker3 - how does this work? We can sneak a look at the model builder definition, which gives us MediaWithCrops. I’ve not had any success with these complex objects, so ended up using a List for this:

List<Dictionary<string, string>>? websiteThumbnail = _umbracoMediaImporter.ConvertPathToUmbracoObject(ogImg);
if (websiteThumbnail != null)
{
    var imgJson = JsonConvert.SerializeObject(websiteThumbnail);
    treeNode.SetValue(nameof(StandardPage.SeoImage), imgJson);
}

Obviously this is a fairly long-winded process and prone to errors, and although I understand the structure of the objects I’d like a “proper” way to go about this.

I have read the docs and found this; which is great, but doesn’t really give guidance on how to actually find the model that you should use.