Before sitting in the pew before Mass begins, one faces the Tabernacle, and if the Sanctuary Light is lit, genuflects, which is on the right knee. The Light being lit means Jesus is present in the Tabernacle. If it is not lit, one makes a profound bow toward the altar. Many places the Tabernacle is behind the altar, but in some places it is not. If it is not behind the altar, one turns toward it wherever it is. If the Tabernacle is not in sight or not in the same location, one makes a profound bow toward the Altar.
If one receives Holy Communion standing and chooses to genuflect beforehand, it is the right knee. If one receives kneeling, it is on both knees. At Eucharistic Adoration, kneeling on both knees. “Genuflection” generally means being on the right knee, while “kneeling” generally means being on both knees.
If one is in the church and walks past the Altar, then one would turn toward it and make a profound bow. That’s bending forward at the waist completely. If the Tabernacle is behind the altar, with the Sanctuary Light lit, one might choose to genuflect toward it instead of bowing.
At the name of Jesus, one bows the head slightly in reverence.
This is assuming, of course, that one is physically capable of doing these things.
From one convert to another, hope this helps.
