Your deep understanding of spellcasting allows you to extend your reach and accuracy when casting spells that require attack rolls. Here are the benefits of this feat:

• When you cast a spell that requires a ranged attack roll, its range is doubled.
• Your spells that require an attack roll can penetrate the defenses of a target with cover. Half cover and three-quarters cover provide no benefit against your spell attacks.
• You learn one cantrip that requires an attack roll, chosen from the spell list of a class you can already cast spells from. The chosen cantrip uses the spellcasting ability modifier of that class.

The Arcane Marksman feat is designed for those who specialize in long-range spell attacks, offering both increased range and the ability to bypass cover.