A1 used to ask about quantity, size, or age: How big is the house? How old are they? How much (= what price) was that dress?
how are you? A1 used to ask someone if they are well and happy: ‘How are you, Ellie?’ ‘Oh, not so bad, thanks.’
A2 used to ask about the way something happens or is done: How did he die? How do you keep the house so clean?
how about..? A2 used to make a suggestion: How about going to the cinema?
how do you do? A2 a polite thing to say to someone you are meeting for the first time
B1 used to ask about what an experience or event was like: How was your flight?
B1 used for emphasis: How nice to see you! I was amazed at how quickly she finished.