If you are coming to Family Historian from another genealogy computer program you may want to start by reviewing Key Features for Newcomers and then the specific advice for migrating from your old program
Sources are an essential part of recording the results of your Genealogy research; they help you, and others, understand how you reached a particular conclusion — and where you might be mistaken
Family Historian version 7 introduces a new way of working with Sources and Citations, although it is possible to continue working in a similar way to Version 6, including the use of Ancestral Sources
Facts are one of the key concepts at the heart of Family Historian; they are how you record the things that happened to, or described, each ancestor (Individual)