The Aosr plugin provides an advanced spaced repetition system for Obsidian users, allowing efficient and customizable flashcard-based learning. With features such as rich text support, a dedicated review window, and minute-level interval scheduling, it offers precision and flexibility for knowledge retention. Aosr supports various card formats, including single-line, multi-line, cloze deletions, and range cards, with deck functionality that allows users to define custom rules for organizing flashcards.