Hanging Phal question regarding air roots

[karebear5612]

I got a large hanging Phal fron lowes. I am a beginner and trying my best with orchids. I hung inside by west facing window and flowers dropped. Not sure if natural
Progression or unhappy plant. I moved outside hanging from tree and cut flower spike once all flowers dropped. The orchid had no medium aroun it in plastic basket, so I’ve added some moss/bark/charcoal mixture. There are some dead roots, but many healthy looking that are green when watered. It has air roots who’s tips were drying up, but now 3 of them have shiny, green, smooth growths at tip. Can anyone tell me what these are? Is it just a normal process of the aerial root or could I propagate?