The only thing I'd add to @red-balloon-89377's dead-on explanation is that you unfortunately need a PHD in Pants to know what the task names are in <goal1.task1>. You can find out using

./pants --explain <goal-name>

, but that's also too much output and confusing. You can find out from 2nd-level

[<name>]

in pants console output too, but like with

--explain

, many of the 2nd-level `[<name>]`s aren't user-level tasks.