Welcome and get ready to get addicted
You can use anything for a jumper! For small links you can use the wire part you snip off your resistors/diodes. For bigger links you will have to use wire, stranded or even better solid. Someone said they used 0 ohms resistors, but I haven't come across any of those yet.
Extra thought: it may not be easy to find 0 ohms resistors but I guess it wouldn't have an impact if you use 1ohm resistors you can get anywhere, right? I have to admit, jumpers kinda mess up the neatness of a board for me.