Render a content type bundle in a custom module template How do I render/display an existing content type form in a custom twig template for a custom module in drupal 8?

I've tried using getform() function, but I dont think that is the correct function. 

I have set a preprocessor variable in my custom module and can see the variable on my custom page via the twig syntax {{dump()}}. Just for simplicity, I would like to know, which class function will allow me to simply render the content type 'article' form , once I can see the article form, i can change it to my custom made form.
I'm not sure what you're exactly asking, but there are various modules that allow you to display entity forms in a block, for example Entityform block (Disclaimer, maintained by me).

Either use that, you can use form modes and/or form alters to then customize the form, or just look at the code to see how to do it.

One thing that this module doesn't support yet is editing existing entities, I'd love to add support for that using the plugin context system.