No, it is not rust resistant. This one is a replacement for an exact model which was rusty and needed to be replaced.
yes slide it to either side it will come off easily
use white round end to mark hole and the drill
The rings have to open or be removable. A closed ring can not be removed without taking down the rod.
the screws will be covered once you put the ends back together
yes use tile drill bit
This is a shower CURTAIN rod. What do you think?
Yes it can be
Need a 1/4” drill bit most likely going into tile so you need a tile bit, comes with anchors you put in wall and screw in with gun or screwdriver takes 5 mins, and that’s taking my time