What is meaning of left.tail->right=root

what is meaning of left.tail->right=root I’m not getting this .

@rssrivastavarohan
hello rohan,
pls once rewatch the video tutorial .

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.