I have been fortunate to work in all the key industries (Service, Startup and Product) across 3 disciplines (Development, QA and Product Management) which shaped up my thinking and experience. Here are a few things which I feel good about:
I get excited by the mission statement of Microsoft which is "To empower every person and every organization on the planet to achieve more"!
I am currently working in the PowerPoint team where we have the mission of 'Enabling users to tell compelling stories anytime anywhere' and we are thinking of some revolutionary features which help us achieve this mission using cutting edge technology.
I believe in self-productivity a lot, so having your company's mission statement on the same lines is a boon :)
Newsletters - Stratechery (Tech and Business Strategy), Lenny Rachitsky (PM), James Clear (Life).
Blog: Reforge, Intercom, Sachin Rekhi's 100 resources for PM, Inverted Passion.
Books - Zero to One, The Mom Test, Alchemy, Deep work, Catalyst.