Lightningduallistbox selected values

1. How do you get the selected value from lightning select?
2. How do you display field values in lightning component?
3. What is combobox in Salesforce?

How do you get the selected value from lightning select?

You can easily get the selected value by using component. find("aura:id"). get("v. value");

How do you display field values in lightning component?

Use the lightning-output-field component in lightning-record-view-form to display the value of a record field on a Salesforce object. Use the field-name attribute to specify the API field name.

What is combobox in Salesforce?

A widget that provides an input field that is readonly, accompanied with a dropdown list of selectable options.