# Guides

Guides provide overviews of each functional area of air travel. They complement the [API References](/apis/flights) and [Workflows](/docs/flights/workflows) by covering basic concepts, usage and support details, and business rules.

|  |  |  |
|  --- | --- | --- |
| **General**  [Getting Started Guide](/docs/getting-started)  [TripServices Flights API Guide](/docs/flights/guides/flights-general-guide)  [Authentication](/docs/getting-started/authentication)  [Common Headers](/docs/flights/general/common-flights-api-headers)  [Transaction and Trace IDs](/docs/flights/general/transaction-and-trace-ids)  [Endpoints](/docs/flights/general/flights-api-endpoints)  [Error Messaging](/docs/flights/general/error-messaging) | **NDC-Specific**  [NDC Guide](/docs/flights/ndc/ndc-guide)  [NDC Guide for Apollo and Worldspan](/docs/flights/ndc/ndc-guide-for-apollo-and-worldspan) | **Flights shopping**  [Flights Search Guide](/docs/flights/guides/flights-search-guide) |
| **Flights Pricing**  [Flights Pricing Guide](/docs/flights/guides/flights-pricing-guide) | **Fare Rules**  [Fare Rules Guide](/docs/flights/guides/fare-rules-guide) | **Seats and Ancillaries**  [Seats Guide](/docs/flights/guides/seats-and-ancillaries/seats-guide)  [Ancillary and EMD Guide](/docs/flights/guides/seats-and-ancillaries/ancillaries-and-emd-guide) |
| **Booking and Reservations**  [Flights Booking Guide](/docs/flights/guides/booking-and-reservations/flights-booking-guide)  [Multi-Content Booking Guide (Flights, Car, and Stays)](/docs/flights/guides/booking-and-reservations/multi-content-booking-guide)  [Comments and Service Requests Guide](/docs/flights/guides/booking-and-reservations/remarks-and-service-requests)  [Reservation Retrieve Guide](/docs/flights/guides/booking-and-reservations/reservation-retrieve-guide)  [Traveler Modify Guide](/docs/flights/guides/booking-and-reservations/traveler-modify-guide) | **TicketIng**  [Ticketing Guide](/docs/flights/guides/ticketing-guide) | **Exchanges & refunds**  [Exchange, Refund, and Void Guide](/docs/flights/guides/exchange-refund-and-void-guide) |


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