Combat in XCOM 2 is turn-based and tactical. Each soldier has two action points per turn, which can be used for movement, attacking, or using abilities. Cover is your best friend; always seek high cover for maximum defense. Flanking enemies removes their cover bonus, making them easier to hit. Understanding line of sight and overwatch mechanics is crucial for setting up ambushes and controlling the battlefield.

Key Concepts:
- Action Points: Two per turn for most units.
- Cover: Half Cover (+20 Defense), Full Cover (+40 Defense).
- Flanking: Attacking an enemy from a position that negates their cover.
- Overwatch: Reaction shot when an enemy moves into line of sight.
- Line of Sight: Crucial for targeting and avoiding ambushes.