Prepare to Fast Six Days of Shawwal

The Messenger of Allah (peace and blessings be upon him) said, “Fasting Ramadan and following it with six days from Shawwal is like continual fasting.” [Muslim, on the authority of Abu Ayyub (Allah be pleased with him)]

Source: https://seekersguidance.org/articles/general-artices/fasting-six-days-of-shawwal-ruling-whether-consecutive-combining-intentions-wisdoms-and-what-if-unable-to-fast-faraz-rabbani/