In his video, IM Lawrence Trent begins by explaining the basic strategic ideas of the Philidor Defence. Before going to the theoretical part he shows the subtleties behind the move order, which is an important issue in the Philidor. This extensive video serves as a good starting point for building an opening repertoire for both White and Black.
Below you can have a closer look at the variations presented in the video by replaying the moves on the board. You can also introduce your own moves and analyse them with the help of the engine.