Please download one of the "Legacy FamilySearch Overview" pdf files at the bottom of this article. There is a file for the general public (individuals who are not members of the LDS or Mormon Church) and a file specifically for members of the LDS (Mormon) Church. The functionality of Legacy FamilySearch is a little different depending on which group you fit into.
There is also a free Legacy FamilySearch video demonstration you can view at https://familytreewebinars.com/webinar/legacy-family-tree-and-familysearch-family-tree/.
Legacy's most recent FamilySearch tools available in the current version of Legacy will continue to be enhanced and made available through Legacy's free updates. Legacy's FamilySearch tools in older versions of Legacy will not be updated.