So my first question about the movies I've had is, if only Sauron can use the ring to its real power, then why does everyone pursue it? Is it because the ring manipulates people to put it on so Sauron would know where the ring is or who posses it?

Next question is more of a speculation question but I've read that the ring needs to be used by someone powerful for it to be useful (which isn't that false since they clarify in the movie only Sauron can use it) hence why Gandalf was so scared to even touch it in FOTR. If that is true then what would happen if Gandalf were to use it. Is Aragorn powerful enough to utilize the ring? Legolas?