Necessary is necesario in Spanish. Necesitas definitely means "you need" in English. It is the informal "tu" form of the verb Necesitar.
You need a dictionary for art class.
Necesito mi computadora, mis llaves, y mucho cafe.
No - it does not mean Jackie in english. "Hedwig" is the English language equivalent for "Jadwiga"
quoi is 'what' in English.
That is mean Emily in English.
But you need a calendar
"¿Qué necesitas para el colegio?" means "What do you need for high school?". The word "colegio" does not mean "college". That would be "la universidad".
"Quien necesitas" means "who do you need" in English. It is a question asking about the person that is needed or required for a specific situation.
what you need to do
You need good days.
You don't need words. or No words are necessary.
"¿Cuántas clases necesitas para los dos programas?" means "How many classes do you need for the two programs?"
Translation: What do you need to drive?
"tú necesitas una calculadora"= you need a calculator
"Por qué tú necesitas mi amor" translates to "Why do you need my love?" It implies questioning the reasons or motives behind someone's need for affection from you.
It means "what do you need for English class". In order to respond, you would say in Spanish what you need for English class.
You need a dictionary for art class.