Stick to the facts and don't make judgments. Stick to the important information that the oncoming nurse needs to know. The ANA's Principles for Nursing Documentation is a good resource.
They're important for continuity of care and making sure that everyone involved with the patient's care is aware of any relevant information. What's consistent across facilities is that a nursing end of shift note is a communication tool to update the oncoming nurse about the patient's status and any changes that occurred during your shift.
Smart move in doing a little research and learning the different methods in which you can write your end of shift note because it's going to vary by facility and type of unit / department.