This system of prioritization is known as 'aggro' (aggression), and mastering it is the most critical mechanical skill in the game.

If you cannot reliably predict which target an enemy unit will choose to attack, you are relying entirely on luck.
Vision and Targeting
When a unit is deployed or finishes destroying a target, it scans its specific sight range for the closest valid enemy.

If a massive, slow-moving tank is lumbering toward your tower, you do not need to place your defense directly in front of it.
Building-targeting units usually have larger sight ranges.Melee units have very short sight ranges.Timing must be faster against fast troops. Manipulating the Z-Axis and Hitboxes
You can use the physical bulk of your own units to literally push enemy troops out of their preferred path.

This highly advanced technique, known as 'body blocking', requires absolute precision but can save hundreds of tower hitpoints.
Troop TypeAggro BehaviorSiege TargetersCompletely ignore all enemy troops, making them incredibly easy to kite across the entire map with cheap structuresMelee AssassinsOften have dash abilities that lock onto targets from far away; must be intercepted before the dash animation begins Drilling the Mechanics
Reading about aggro ranges is completely different from actually executing pixel-perfect placements in the heat of a live match.

Once you internalize the invisible grid that governs the AI, the game slows down dramatically.

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