Becoming a bitcoin expert means its like a sales person who have a lot of expertise at their disposal and you are well versed and more knowledgeable compared to other people using the same product which in this care the bitcoin. You must also be updated to any news about whats in and whats new about bitcoins on who are the people supporting it which includes how the companies even the government thinks about bitcoin. You must also have a lot of sources if people will ask you where they can get bitcoin.