The watchdog lists the events and errors of Drupal. Watchdog is a term from Drupal5. It has been replaced by dblog and syslog in Drupal6, but the term is still often used.
The module webforms allows to create, configure and integrate all kinds of forms to a Drupal website.
The workflow describes the validation circuit, the tasks to be performed between the different actors of a process, the deadlines, the validation methods, and provides each of the actors with the information they need to carry out their task. For an online publishing process, for example, it is the modeling of the tasks of the entire editorial chain. Drupal allows you to create complex workflows for a website.
The Wysiwyg editor is a user interface that provides a list of options for formatting text. It allows to visualize a document as it will be published.