There is some material that was shared not long ago which will be useful to you in learning some basics, here is a page regarding jumper repair

Proper Soldering Techniques

Also I would fix any trace that looks bad, black or is starting to corrode. It might have continuity today but tomorrow it may get worse, do it all at once then take out the motherboard 5 more times in the future

rewarding the wires it was mentioned to match the same size as the trace is, a bit hard to visually do but if its a small trace use a small wire big fat trace use bigger wire

Wow ... thanks for sharing treeman ... a lot of good info. in that IPC archive. Maybe there's hope for me yet 😀 Also ... I'll see about getting some small gauge wire as these traces are tiny. Thank you!

no problem, only passing on the knowledge I learned here too, good luck