The Wikipedia article seems far more useful:
https://en.wikipedia.org/wiki/Modern_Monetary_Theory
To quote the intro:
"MMT advocates argue that the government should use fiscal policy to achieve full employment, creating new money to fund government purchases. The primary risk once the economy reaches full employment is inflation, which can be addressed by raising taxes and issuing bonds, to remove excess money from the system.[3] MMT is controversial, with active debate[4] about its policy effectiveness and risks."