Does an auspicious day mean that everything goes well? For example, buying real estate today is suitable for buying real estate! Getting married is getting married, just doing things on a good day?

Not necessarily, if you get married, because all good days are based on the horoscope of the two of you. You see, the Gregorian calendar is a good day, but it may not be suitable for you. So either you believe it, you have to believe it to the end and find someone to help you calculate it, or you don't believe it. It's better to hit the sun when choosing a day, so let's refuel our time. This is my personal suggestion.