How do you create a lightning message channel?

To deploy a LightningMessageChannel into your org, create an SFDX project. Include the XML definition in the force-app/main/default/messageChannels/ directory. The LightningMessageChannel file name follows the format messageChannelName . messageChannel-meta.

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Keeping this in consideration, does record have lightning id?

This interface has no effect except when used within Lightning Experience, the Salesforce mobile app, and Aura-based Experience Builder sites. When your component is invoked in a record context in Lightning Experience or the Salesforce mobile app, the recordId is set to the ID of the record being viewed. Does init lightning? init is a predefined event sent to every component. After the component is initialized, the doInit action is called in the component's controller. In this sample, and the controller action sets an attribute value, but it could do something more interesting, such as firing an event.

One may also ask how do you call an aura controller?

Invoke Apex from Lightning Component | how to call an Apex class from a Lightning component Add Controller attribute in Define

What is connected callback?

The connectedCallback() is a lifecycle hook in lightning web component . It fires when a component is inserted into the DOM. It runs once when the component inserted. We can Access elements the component owns inside the connectedCallback() method in Lightning Web Component like template.