Heat the wire, not the solder...except for heavy guage wire where that may be the only way to start.
WBT silver solder is good but not practical to buy a whole spool for a couple connections. There is copper based solder that many consider better for the dollar but, as I said, don't worry about it for a couple connections and just get some Rat Shack resin core.
WBT silver solder is good but not practical to buy a whole spool for a couple connections. There is copper based solder that many consider better for the dollar but, as I said, don't worry about it for a couple connections and just get some Rat Shack resin core.