How do you add a new link into the My Account sidebar?

What is the relationship between products and categories in Magento?

While developing a module you need to modify an existing Data Patch.
How can you force Magento to execute an existing Data Patch file again?

In a custom module you are adding a new field to the store configuration. The field will set the value for the configuration path mycompany/mymodule/myoption.
How do you supply the default value for that configuration option?

A module you are working on needs to send a newsletter to all subscribed customers at predefined intervals.
Which two actions do you take to make sure the newsletter is sent? (Choose two.)