communication: the conveying of information between two or more entities

It would be good if~

succeed / be successful in life

success / success in life, achievement in the world

key

(computing) key / (music) key

key (tool for opening or locking something) / key; clue (important fact for solving something) / lock

all right, OK / An interjection used when comforting someone; alright

Classical Japanese form of 良い (yoi)

good