Drupal Migrations: Basic Migration descript file for a CSV file as datasource.

article_csv_import.yml

uuid: 1bcec3e7-0a49-4473-87a2-6dca09b91aba
langcode: en
status: true
dependencies: {  }
id: article_csv_import
label: 'Migrating articles'
source:
  plugin: csv
  path: modules/custom/migration_csv_module/csv/migration_csv_articles.csv
  delimiter: ','
  enclosure: '"'
  header_offset: 0
  ids:
    - id
  fields:
    -
      name: id
      label: 'Unique Id'
    -
      name: title
      label: Title
    -
      name: body
      label: 'Post Body'
    -
      name: tags
      label: 'Taxonomy Tag'
    -
      name: image
      label: 'Image Field'
process:
  title: title
  body: body
  tags: field_tags
  image: field_image
  type:
    plugin: default_value
    default_value: article
destination:
  plugin: 'entity:node'