General

There are 3 different site sizes. Frigate and Cruiser ones spawn in HS, in LS there's the Cruiser and Battleship sized ones.
The frigate sized site is about defending one location, the cruiser and battleship sized sites spawn 3 points to defend (alpha, beta, gamma).
Warping to a specific anomaly (defence complex, defence grid, war grid) for the first time, spawns the locations to defend.
Once in a system, warping to the first site of a specific size starts a operation timer during which 1 (frigate) or 3 (cruiser/battleship) different locations (alpha, beta, gamma, delta, epsilon) have to be defended (by killing the hostile rats and being present while accumulating defence points).