IRS Tax-Exempt Organization Search Tool:
Use the search tool on the IRS website to confirm that the organization is registered as a tax-exempt 501(c)(3) and is eligible to receive tax-deductible donations.
Charity Watchdog Organizations: Check reputable watchdog groups that evaluate charities based on financial health, accountability, and efficiency.
An evaluation strategy known as "lateral reading" is also hugely helpful. That is, search for context, published by well-known sources, about the organization for ratings or reviews. Avoid unofficial opinion forums such as Reddit unless comments point to reliable sources.
Let's take a look at one: Look up Kids Wish Network