Q: Paul, what is a good resource for understanding common customs, like crossing yourself with holy water, genuflection, bowing, beating your chest, etc ?

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A: This is the classic: https://litpress.org/Products/6048/Signs-Words-And-Gestures?srsltid=AfmBOop_4zvjXUjbs26GTSWWx35ycDehzJISgPHMd5-ggk6ZBApsFJqr