These are two of the most famous and important positions in Endgame Theory.
Here are the Wikipedia methods to each position and the knowledge behind each.
Lucena Position and Philidor Position
Here are the interactive trainers for each position as well so you can practice each.
Philidor Position Endgame Video Lesson - 35 min Video lesson By FIDE Master Dennis Monokroussos
Building the tree of scenario's
11 hours ago