First Drupal migration example - https://understanddrupal.com/migrations

module_location.txt

.
|-- core
|-- index.php
|-- modules
|   `-- custom
|       `-- ud_migrations
|           `-- ud_migrations_first
|               |-- migrations
|               |   `-- udm_first.yml
|               `-- ud_migrations_first.info.yml

ud_migrations_first.info.yml

type: module
name: UD First Migration
description: 'Example of basic Drupal migration. Learn more at <a href="https://understanddrupal.com/migrations" title="Drupal Migrations">https://understanddrupal.com/migrations</a>.'
package: Understand Drupal
core: 8.x
dependencies:
  - drupal:migrate

udm_first.yml

id: udm_first
label: 'UD First migration'
source:
  plugin: embedded_data
  data_rows:
    -
      unique_id: 1
      creative_title: 'The versatility of Drupal fields'
      engaging_content: 'Fields are Drupal''s atomic data storage mechanism...'
    -
      unique_id: 2
      creative_title: 'What is a view in Drupal? How do they work?'
      engaging_content: 'In Drupal, a view is a listing of information. It can a list of nodes, users, comments, taxonomy terms, files, etc...'
  ids:
    unique_id:
      type: integer
process:
  title: creative_title
  body: engaging_content
destination:
  plugin: 'entity:node'
  default_bundle: page