What's an absolutely fucking black magic is the use of articles. The frivolity with which a's and the's are sprinkled through an average sentence is genuinely infuriating. There are rules, but "they are more like guidelines". In reality asking native speakers why they used the here, but not there typically draws blank looks. Having used English daily for over 20 years I still have to resort to A/B testing the placement (or not placement!) of articles in my head and check which option sounds "more English."