For a where / what / who question with be, the question word goes first, then the be-word. Each question word asks about one thing: where asks about a place, what asks about a thing, who asks about a person.
Start with the question word
Amina is at home. → Where is Amina?
This is a cat. → What is this?
She is happy. → Who is happy?
Not "Where Amina is? (this is the statement order)" — say "Where is Amina? (question word first, then is)". Put the question word first, then move is in front of the name.
Try it: Amina is at the library. Ask where Amina is. Answer: Where is Amina? — In a question the is comes before Amina: Where is Amina? "Where Amina is" is the order for a statement.
Where is Amina? — She is at home.
What is this? — It is a cat.
Who is happy? — Amina is happy.
Where — asks about a place
What — asks about a thing
Who — asks about a person
How are you?
How asks about the way someone is. The answer is a word like fine or good, not a place and not a thing.
How are you? I am fine, thank you.
How is Lars today? He is tired.
How are you this morning? I am good.
Not "Where are you? (this asks about a place)" — say "How are you? (this asks about you today)". How asks about the way someone is.
Try it: ___ is Lars today? - He is fine. (How / Who / Where) Answer: How — "He is fine" says the way Lars is, so the question word is How. Who asks which person, and Where asks about a place.
Answering with be
Your answer needs is, are or am too. Pick the one that matches who or what the answer is about: It is… / They are… / I am…
Where is Sofia? She is at work.
Where are the keys? They are in my bag.
Where are you? I am at home.
Not "Where is Sofia? She at work." — say "Where is Sofia? She is at work.". The answer needs is, are or am too.
Try it: Lars: Where are your keys? Sofia: They ___ in my bag. Choose the word that completes Sofia's answer. (is / are / am) Answer: are — They means more than one, so the answer uses are: They are in my bag. is goes with one person or thing, and am goes only with I.