Sometimes, in your Drupal site, you may need to crop images with a predefined aspect ratio but with different size values within a certain range. This is where the Image Widget Crop module is your tool for the job.
Zurb TwentyTwenty module is mostly intended to highlight the difference between two images on a Drupal site. You certainly saw those advertising images for skin products, for example.
You most likely created image styles with Drupal's "Scale and crop" image effect. This style allows you to display large images on a smaller scale and save precious screen space.
Finding easy to use modules for Drupal 8 is not always easy. Often they haven't been migrated from Drupal 7. Or they are still in beta. Or the documentation is either poor or non-existent.
Sometimes you would like to import a huge volume of data from a CSV file into Drupal. Maybe from another CMS. Maybe from a spreadsheet. But there is no such functionality in Drupal 8 core.