Feeling the slope
Feeling the slope
The main skill for reading the greens with your feet is training your feeling of the direction and amount of slope.
Learning to feel the direction and amount of slope takes practice with accurate feedback. I recommend using a digital level to check your answers after you've felt the slope. This can be done in practice or using a slope board at home. I recommend training until you can feel 1, 2, 3, and 4 percent slopes to an accuracy of about half a degree consistently.