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User research focuses on understanding user expectations, behaviors, needs, and motivations through methodical, investigative approaches. Insights are then used to ensure that all product design decisions do benefit the user.
What I learn from this: Mobile first, and put the most used elements down to the reachable zone as the size of the screen is bigger and bigger for one hand users.
User experience (UX) is where business goals and user goals intersect. It is how a human feels when using a product while attempting to accomplish a task or a goal.