This is covered in the manual Getting the Most From Family Historian in either Chapter 14 – Merging, Comparing and Splitting Tree Files or in later editions Chapter 15 – Compare, Merge, Split, Copy and Export GEDCOM Files
Use of the Julian and Gregorian calendars is a very complex topic and this article deliberately tries to simplify the topic by missing out a lot of the details
If you select only one Individual Record before viewing an Ancestors Diagram, or Ancestors & Descendants Diagram, or All Relatives Diagram then the Ancestors of only that person are displayed in the Diagram
The Work with Data Dialog is used to display and manipulate lists of Places, Addresses, Occupations, Religions, Groups/Castes, National or Tribal Origins, and Source Types
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)
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
Zotero was developed primarily to assist in writing academic papers – where the quality of the references is one of the major contributors to “Indications of Esteem”