How am I supposed to soldering this? I have both soldering iron and a spool of solder. But most videos show soldering wires instead of what I need as you can see in the picture (disconeted cable on a laptop charger). I would higly appreciate any info and tutorial videos on this.
Edit: Video https://streamable.com/zeu6gm
That looks like a broken single piece. You might be able to get soldered. (See other guys post for the way to do it) but to be honest it probably won't last if holds at all.
I'd check e-bay for the whole connector piece. It looks designed to be easily replaced. I bet it comes with wires. What's on other end of wires? At worse, you solder splice the wires for something a lot stronger.
Edit: another other option. It looks hollow? If so, cut the broken end piece off wire completely. Strip the wire and slide it the hole directly. (May have to strip it down to fit) this would be much better than soldering the nub back on.