Flocon de toile | Freelance Drupal: Add a relationship to a View programmatically with Drupal 8

To make queries and build listing pages on Drupal 8, or any other content to collect, we have EntityQuery, the API Database (see Make a SQL query on multiple tables with Drupal 8) or the Views module which provides us an extremely powerful requester and graphical interface. Each of these methods has its advantages and disadvantages and may be more appropriate in certain situations (complexity of the request, etc.).