How ... how ... What's the difference (usage)? thank you

What about … and how about … are two commonly used ellipsis sentence patterns in spoken English. Their meaning and usage are basically the same, and they are often used in the following situations. For example:

1. Make suggestions or requests to the other party. For example:

1. How about going out for a walk? How about going out for a walk?

How about another piece of cake? How about another piece of cake?

Second, ask the other person's opinion or opinion. For example:

How about playing the violin? What do you think of her playing the violin?

How about this TV play? What about that TV play?

Third, ask about the weather or health. For example:

What is the weather like in your hometown? What's the climate like in your hometown?

How is your uncle now? You can't leave him with him. How is your uncle recently? You can't let him live alone.

Fourth, when greeting, take this opportunity to undertake the context. For example:

I come from Beijing. What about you? I'm from Beijing, and you?

5. Cross-examine the statement and often give hints to the other party. For example:

I have a good memory. I have never forgotten anything. I have a good memory and never forget anything.

What did you do when you left your office key at home? What happened when you left your office supplies at home?