自信

1. Origins, structure, and basic meaning

• Structure: 自信, read じしん, means trust in one's own ability or judgment.
• Basic usage: It expresses confidence that one can do something well.

2. Common pitfalls and similar expressions

• What one is confident about
  • In the example, 発表には自信があります expresses confidence about the presentation.
  • に marks what the confidence concerns, and the following は makes it the topic.
• Gaining confidence
  • 自信がついた says that confidence developed through experience.