What are those other things he was referring to?
These are further back in the archive (and new takes might show up) but have a look at these answers by:
u/raff_riff to "'We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard.' What are the other things"
u/Doe22 and u/KayBeeToys to "In JFK's Moon speech, what are the 'other things' he speaks of that we will do?"