Difference of word

What does  would,want,wanna mean and please can someone explain the difference.

'Want' is a desire for something now. 'I want a new job.'

'Wanna' is slang for 'want to' - 'want to' is followed by a verb. 'I want to eat a cake.'

'Would + like' is often used in polite language for want - 'I would like a cup of tea.'

'Would' itself is often used as the past/polite form of 'will'

Hope this helps

Bob