Three common Drupal migration scenarios

While working on migration to Drupal projects using Drupal Core Migrate
subsystem, there are some recurrent patterns.

This presentation explores three of those recurrent scenarios:

- Multiple destinations for one source
- Chicken and egg dependencies
- Continuous updates

I find them really often, and there has been recurrent questions about them in
places like the #migration Drupal slack channel.

Alternatives to approach those scenarios will be presented and criteria for when
to choose them.