What advice do you have for new grads trying to learn more about product marketing and getting a first entry-level job?

(1) Learn as much as you can about the product and do your research - it's really easy these days to learn the competitive differentiators of your products, read analyst reports, what customers say, how they market, etc. 

(2) Be useful and humble - if you're looking for an entry level position - be open to learning and be useful - be willing to go the extra mile to add value - whether it's editing a slide deck or reviewing copy. Anything you can do to add value for your manager. 

(3) Talk to your sales teams - they are the brand ambassadors and many times, the first users of the products (especially SEs) so use them to learn what you can about and how they demo/talk about the differentiators, handle customer objections, etc.