経験者

1. Origins, structure, and basic meaning

• Structure: 経験者, read けいけんしゃ, is an experienced person or veteran in a specified activity.
• Basic usage: 経験者から教わる makes that person the source of advice; 経験者を対象にする makes experienced participants the course audience.

2. Common pitfalls and similar expressions

• Source of advice and target audience
  • から marks the knowledgeable source, while を対象に marks the group for whom instruction is designed.