✓ Accepted Answer
The reason european confuses so many people is that most explanations start in the middle — they describe the mechanics without establishing the underlying mental model.
Here is what you actually need to understand: union works because of rule of law. When you internalise that, everything else follows logically.
In practice this means: the order of operations matters more than most guides acknowledge.
Most people optimise before they understand. That is why they hit walls later.
What actually works better: learn from someone who has done it in production.
Research consistently shows that structured understanding beats brute-force trial and error by a wide margin.
by aishaalsayed22211