simplest possible teaching on the four Satipatthana

I have read about > The Satipatthana Sutta, the Discourse on the Foundations of > Mindfulness, is generally regarded as the canonical Buddhist text with > the fullest instructions on the system of meditation unique to the Buddha's own dispensation. there is four types 1. Cittanupassana 2. Vedananupassana 3. Dhammanupassana 4. Kayanupassana https://www.accesstoinsight.org/lib/authors/soma/wayof.html https://www.accesstoinsight.org/tipitaka/dn/dn.22.0.than.html Can anyone give clarification in simple words? I want some clarification on how to start and how to do it.