Because there can be slight variations depending on the exact model and trim level, it's best to:
1. Consult your owner's manual: This is the most reliable source for the exact location.
2. Look for a clear, capped reservoir near the master cylinder: The master cylinder is the main brake component, and the reservoir is usually very close to it.
3. Search online for a picture: A quick image search for "2000 Chevy Tracker brake fluid reservoir" might show you exactly where to look.
Be careful when checking or adding brake fluid. It's corrosive and can damage paint. If you're not familiar with working on your car's braking system, it's best to have a qualified mechanic perform any maintenance.