Migrate node with paragraphs from Drupal 7 to Drupal 8

I’m trying to figure out how migrating content from a Drupal 7 site to a Drupal 8 site works. I managed to understand how to create a custom module to migrate nodes with regular fields to my new D8 site.

But I also have one content type where I use paragraphs. And I can’t seem to find a well documented example on how to do this. I found some examples but they all seem to use different methods. This one seems like the most up to date. But how to make the code from #9 work?

field_paragraphs: plugin: sub_process source: field_source_paragraphs process:   target_id:     -       plugin: migration_lookup       migration:         - paragraph_box         - paragraph_grid         - paragraph_text_embedded       source: value     -       plugin: extract       index:         - 0   target_revision_id:     -       plugin: migration_lookup       migration:         - paragraph_box         - paragraph_grid         - paragraph_text_embedded       source: value     -       plugin: extract       index:         - 0 

So the field_paragraphs and field_source_paragraphs I understand. But what are these paragraph_ items under migration? Is this where I set the paragraph bundles? And if not where do I set the paragraph bundles and there fields? So where do I begin? What are the right steps to take?

Thanks in advance