What is the three perilous encounters that perseus experienced during his adventure

Perseus is one of the Son of Zeus that is half human half god, or a Demi-God. Perseus journey is a very known story in greek mythology is because Perseus is the one who beheaded medusa and also killed the kraken (in the movie) by using the cure of the head of medusa or its stone gazed. For me the three perilous event that he encountered was First when perseus hostage the gray women and take away it eye to find the location of the Nymph, Second is when he fight medusa with the sword that is given by Hermes and the Shield given by Athen, and the Third is when he fight and killed the serpent in the rock where Andromeda was chained.