I answered this above in my answer around soft and hard skills but if I were to pick my top, universally important skills for a PMM they would be:
From there, it really depends on your specific role and where you want to specialize. The skills each PMM has really depends on what's needed for them in their role.
I'll take a more nuts & bolts approach to this question. The two skills I see as mandatory are writing ability and presentation ability. With the ability to write and speak well, a PMM just isn't going to be effective and is more likely to be a great product manager.
Empathy is a critical skill, and it is in short supply. Your customers only care about what matters to them. Engage them in structured conversations. Listen carefully. Then reread your messaging to see if it resonates. Look to see if your message is in channels they trust. Data will tell you alot, but actual people will tell you what matters.
Yes, this is a pretty standard PMM interview question. When I ask, I am typically looking to see if the candidate understands product launch and go-to-market fundamentals. I'm also interested in which parts of the launch they led (i.e. was it a specific marketing channel or soup-to-nuts?).
I also like to ask different variations of this question, like "tell me about a product launch that did not go well and you had to get back on track" because let's be honest, not every launch goes exactly the way we plan :)
Well, the question of "What is Product Marketing" Could mean different things at different companies, but my answer is that we provide the voice of the market and the voice of the customer internally to the product manager so we can build products that resonate with our audience, and we are the voice of the product externally providing the appropriate messaging and positioning to go to market.