Thanks for reading Gaurang! There are tons (maybe too many) of prototyping tools that allow you to animate, but my favourite is Principle (not a sponsor, unfortunately 😁), it requires absolutely no coding skills and is SUPER easy to pick up. It's probably easier than keynote, just for reference.
Now, if you want richer animation, Principle doesn't allow you to do everything but it's good because you can get an interactive prototype out of it.
For richer animations I use After Effects, that's where I made that UFO kidnaping the file for instance.
I hope this helps.