Exactly - you’re the one who’s gonna tell the sword where to be located
You add a socket (to some Static/Skeletal Mesh) with your own name, you set it’s location, which bone is the parent, rotation and everything (also you can use a Preview Mesh there to test without starting the project)
As you have a socket you use the Attach Component to Component or Actor to Component (depends on what is the sword) and you have a place to enter the name of the socket - remember that the Parent has to have this socket or else it will use Root, in case you misspell the word (case sensitive) it will also use Root