User Options are preferences that are specific to your account on Nova. Typically, these include things like notification preferences, and user interface options.
General options for your user include your Dark Mode or Light Mode preferences, and importantly your time zone. The time zone is used when showing graphs and data, sending alerts and more. Ensure you have set it correctly if auto-detecting has failed.
By default, all users receive notifications for their organisation. You can customize what level of notification (low, normal, high, critical) you receive and which ones are emailed vs sent via text message (SMS).