Users face usability issues 80% times if navigations are not properly designed. Make sure they nd what they want, show way to go back, let them know where they are and what to do next.
Make visual processing easier for users by creating proper hierarchy using visual weight, alignment and consistency.
People scan text so design for scanning. Use White space, Active voice, Capitalisation for tabs, Simple language and avoid Jargons.
User ow has to be intuitive and informative enough so that user can understand how to complete a task easily and information/alerts after task completion or failure should be clear and visible.