Where can I learn about the accounting terms used in not-for-profit organizations?

FASB website....................

Thanks for invitation,

I do believe to try to use The financial Accounting Standard Board (FASB) web-side, hoping to find same  useful, benefit and satisfy your requirements.

Nonprofits do not have commercial owners and must rely on funds from contributions, membership dues, program revenues, fundraising events, public and private grants, and investment income.

From churches to youth organizations to the local chambers of commerce, nonprofit organizations make our communities more livable places. Unlike for-profit businesses that exist to generate profits for their owners, nonprofit organizations exist to pursue missions that address the needs of society. Nonprofit organizations serve in a variety of sectors, such as religious, education, health, social services, commerce, amateur sports clubs, and the arts.

on FASB  web Site and documents