First of all, ECBA is not a certification it's a certificate. Entry Certificate to Business Analysis or ECBA is a certificate from IIBA (International Insititute of Business Analysis, a non-profit association to support and promote Business Analysis) to those professionals who proved that they have adequate foundational-level knowledge in Business Analysis.
You can take up the IIBA Entry Certificate in Business Analysis course to help you clear the exam and start your professional journey. Also, watch the following video on Business Analyst to get a better idea.