Local actions are links that relate to a given route and are typically used for operations. For example, on a list page, you might have a local action link to create a new list item, which will take you to the relevant form page. In the following screenshot, we can see a local action link used to create a new user on the main user management page:
Modules can define local action links inside a module_name.links.action.yml file, whereas other modules can alter them by implementing hook_menu_local_actions_alter().
