What is the proper way to receive and consume the Eucharist?
Is kneeling optional or highly encouraged?
By the hand or the tongue?
Is there a canon law regarding the proper way to receive or chew the body of Christ?
Within the Roman Church: universally, kneeling; some places allow standing. Universally, on the tongue; in some places, in the hand (one hand in the other, then, with the lower hand take if from your hand to your mouth). If receiving from the cup, when the cup is presented, take it reverently in both hands and take a small sip.
Responses: In the OF, respond amen to the phrase “The Body of Christ” with Amen. In both OF and EF, say nothing after reception, but make the sign of the cross.
The Eucharist is to be consumed as food. Some let it dissolve on the tongue, others chew with gusto.
Note that the standard for the Roman Church doesn’t apply in the other churches united with Rome.
Within the Byzantine Rite - approach, toes to the ambon, standing, tilt your head back, open your mouth wide, say nothing. If taller than the minister, bend your knees a little. After receiving step to the side. It’s common to make the sign of the cross, after moving out of the way, but not in rubrics.