Cepheus Trader is a persistent game about commanding a person, a crew, and a starship in a shared far-future universe. Time and distance matter: ships take days to travel, news moves with ships, and another captain may act while your reply is still in the mail. You do not need prior knowledge of Traveller or the Cepheus Engine.
Press ? wherever it is offered to learn the idea behind the current screen, what the displayed choices do, and what a sensible first step might be. The help browser also contains concept articles and a glossary. Nothing in help reveals information your captain has not learned in play.
Beginner help introduces the ideas before the controls. Expert help is a compact screen reference. You can switch for one visit at any help pager prompt, or change your normal default in Player Preferences.