Jakob Nielsen's 10 general principles for interaction design. They are called "heuristics" because they are broad rules of thumb and not specific usability guidelines.
Usability
10 Usability Heuristics for User Interface Design
Knowledge
How to Build a Bulletproof Product Design Strategy
Designers can have a more significant impact than pushing pixels and can help with the totality of what we produce. But this can only be achieved when product design is implemented from the start, at the strategy level.
Startups
How to Build a Bulletproof Product Design Strategy
Joe Leech offers a rundown on his UX review process, sharing tips about analysing data and creating personas, and setting out findings in a form that benefits clients. From quick wins to workshops, there are gifts here everyone will be grateful for.
UX Review
How to Do a UX Review
Knowledge
Stakeholder Interview — UX Knowledge Base Sketches
At the beginning of a UX research and design project a Stakeholder Interview should be conducted to find out the Business Goals, Existing Research including User Research, Competitors and Technological Limitations.
Interviews
Stakeholder Interview — UX Knowledge Base Sketches