I sure like to refer to IRS resources, since they have most of the control over these things:
https://www.eitc.irs.gov/other-refundable-credits-toolkit/what-you-need-to-know-about-ctc-and-actc/w...
And there are other links right there, for when you want to know more about, well, more stuff.
*******************************
Don't yell at us; we're volunteers
