How to create dispatch queue in Swift?

This tutorial for queue operation and how it's works.

Create Concurrent Queue:

let concurrentQueue = DispatchQueue(label: "queue-name", attributes: .concurrent)
concurrentQueue.sync {

}

Create Serial Queue:

let serialQueue = DispatchQueue(label: "queue-name")
serialQueue.sync { 

}

Create Main Queue Async:

DispatchQueue.main.async {

}

Create Main Queue Sync:

DispatchQueue.main.sync {

}

Create Background Thread:

DispatchQueue.global(qos: .background).async {

}

Call After a second:

DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(1000)) {
   // Code
}

Send comment for any more updates.

Thanks.