Is “free “, good marketing?

Most professionals understand that you need to gain credibility with potential clients before they sign up and you typically do that by “educating” them ie giving away information that shows your expertise.

How far do you go with giving away information for free?

David Brown, an insolvency lawyer in Sydney, provides a free online debt collection service for matters that are not cost-effective for a lawyer to do.

Family Court Forms offers free online divorce applications.

Is there a service you can reasonably provide for free which  will attract potential clients?