A very common use-case in Lightning Web Component is iterating a list over an array in HTML file using for:each or iterator directive. Many times as a developer, we have to do something on the items based on user interaction. You would definitely require to get selected record id from custom iteration.
Lightning Web Component is the new way of building Lightning Components in Salesforce. There are high chances that you may end up with some common error.
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?