Great! Here are three useful business terms:

1. **Synergy**: The combined power of a group working together that exceeds the sum of their individual efforts.

2. **Scalability**: The ability of a business to grow and manage increased demand without compromising performance or losing revenue.

3. **Value proposition**: The promise of value to be delivered to the customer, highlighting unique benefits and differentiators.
Here’s a more natural and fluent version of your sentence:
"I'm interested in the business field." (Adding "the" sounds more precise.)
Alternatively, you could say:
- "I'm interested in business." (More concise and natural)
- "I'm interested in the field of business." (Slightly more formal)
Tips for improvement:
1. Articles ("a/the") – Many learners forget them, but they’re important in English.
2. Conciseness – "I'm interested in business" is smoother than "business field."
3. Natural phrasing – Native speakers often just say "I'm into business" (informal) or "I'm interested in business studies" (if referring to academics).
Would you like help with a specific situation (e.g., job interview, casual conversation)?