UNDERSTAND GETTER IN LIGHTNING WEB COMPONENT
OPEN LIGHTNING COMPONENT FROM URL BUTTON IN LIGHTNING
When name attribute is defined in slot element, it is known as named slots where as slot without a name attribute is called unnamed slots.
You might have passed data from Parent Lightning web Component to Child Lightning Web Component but have you ever came across any requirement to pass markup from Parent to child in Lightning Web Component?
Lightning Web Component has the ability to pass data from parent component to child component, but sometime you might need value change handler in child Lightning Web Component when the value is passed from parent Lightning Web Component.
Are you looking for adding or removing rows dynamically in Lightning Web Component to create records or do something else?