LinkedIn Senior Software Developer interview questions

I got a call from recruiter for technical phone screen round. She mentioned I would be expected to solve two DSA questions. I was asked 1 dsa question , Find leaves of binary tree leetcode question. I was able to give optimal approach in 15 min. Interviewer didn’t understand it and went on to ask about 1NF, diff between unqiue key and primary key and indexing. He also asked another coding question in last 10 min. I was able to give answer to the first part.

standard process, they send a youtube series on what the name of each interview round is and how the interview will look like but dont follow it. Why send a yt series if you do not follow it is beyond me. 5 interviews, 3 LC, 1 sys design round which they converted to LC on the fly (found out about it mid interview) and one manager interview