  A short introduction to N = 1 supergravity in four dimensions in the
superspace approach is given emphasising on all steps to obtain the final
Lagrangian. In particular starting from geometrical principles and the
introduction of superfields in curved superspace, the action coupling matter
and gauge fields to supergravity is derived. This review is based on the book
-A supergravity Primer: From geometrical principles to the Final Lagrangian-
and on several lectures given at the doctoral school of Strasbourg.
