Learning to recite even one verse correctly is part of the path of knowledge. Teaching others, however, requires care with wording and pronunciation.
Examples:
1. Someone correcting mistakes in recitation is engaged in learning.
2. Someone explaining a rule they have mastered is engaged in teaching.
3. Someone unsure of a verse’s meaning should not present an unsupported personal opinion as certain interpretation.
خَيْرُكُمْ expresses merit. It does not imply that learning a single rule cancels other religious duties.