H is pronounced at the beginning of a word.

It is aspirated, that is to say it sounds like a breath made in the mouth.

It is not like Spanish jota.

There are some English words in which H is not pronounced:

heir- heredero

heiress

honour

hour

honest

busy is pronounced /’bIZI/. Business is the abstract noun from it. It means negocio which is why internet domain name .biz is used for businesses.