whats the appropriate way of greeting others

-Good Morning, how was your day today?
-Hey, what's up?

It depends upon whom you're greeting.

Your first sentence has a problem, though. Since you said it's morning, you wouldn't use the past tense about the day. You might say, "Good morning, how is your day going?" Or you might say, "Good evening, how was your day today?"

thnx. if i were to greet a friend, then could i say Hey, what's up?

Yes.

if i were to greet my parents, could i say that as well?

That depends upon your parents. But, in general, you'd greet older people more formally -- like -- Good evening, how was your day.

I received a robo-call today from our Congressional representative. He started the message with "Hey! This is Fred Upton." As a senior citizen, I resented this informal greeting from someone I don't know.

okay thnx

There are various ways to greet others, and the appropriate way depends on the context and the relationship you have with the person you're greeting. Here are two examples of common greeting phrases and how you can use them appropriately:

1. "Good Morning, how was your day today?": This is a friendly and polite greeting typically used in more formal settings, such as with colleagues, acquaintances, or people you're not very close to. It shows a genuine interest in the person's well-being and can be used during the morning hours to inquire about their day so far. It's essential to be attentive and actively listen to their response.

2. "Hey, what's up?": This is a more casual and informal greeting that you can use with friends, family, or people you have a close relationship with. It's a simple and relaxed way to start a conversation and check in on how they are doing. Using this greeting often implies that you're open to having a more casual conversation or discussing activities and events.

Remember, it's essential to consider the context, relationship, and level of formality when selecting a greeting. Being respectful, friendly, and aware of the situation will help you choose the appropriate way to greet others.