fmt.Fprintln(os.Stderr, message)

1. func println: writes the result to standard error.
2. func New: func New(out io.Writer, prefix string, flag int) *Logger; the out variable sets the destination to which log data will be written.
3. func Errorf: Errorf formats according to a format specifier and returns the string as a value.
4. func Fprintln: func Fprintln(w io.Writer, a ...any) (n int, err error); Fprintln formats using the default formats for its operands and writes to w.