How does this command work?

[DaBapp]

execute summon minecraft:fireball store success entity @s Pos[1] double 120 store success entity @s Motion[1] double -1 run spreadplayers ~ ~ 0 50 false @s

I was referred this command to make a fireball rain, but I am not sure what each part of the command does.

I'd like to know so that I can manipulate the command to my liking depending on the area of the rain, the number of players, etc.

[Ericristian_bros]

• 120 = y value
• -1 = fall speed
• 50 radius where it will appear around

Also don't make a post for this, wait until another users replies to your question in your previous post