Salesforce introduce Launch Pad standard Lightning Component you can add to any Lightning page. They create a shortcut to important places for your users. You can add any items that have tabs associated with them—standard and custom objects, Lightning web components, Lightning pages, Visualforce pages, and external websites.
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?
Are you looking for adding or removing rows dynamically in Lightning Web Component to create records or do something else?