FP Zero won't turn on

[Flavor]

If it got hot, I would suspect maybe a bridge that is connecting 2 (or more) pins.

To practice, maybe I would try to get a plated perf board something like this (https://www.ebay.com/itm/1pc-Double-side...Sw8bpajL6F) but there are plenty of others out there.

Get some header pins and get a couple female sockets (or a breadboard). It's helpful to plug the pins into a socket/breadboard before soldering. Then they won't drift around when they get hot.

I've had good luck with this seller:
https://www.ebay.com/str/MDFLY?_trksid=p2047675.l2563

And he will combine shipping if you ask. Here are some items to check out.

https://www.ebay.com/itm/2x20-POS-2-0mm-...7701!US!-1

https://www.ebay.com/sch/m.html?_odkw=&_...d&_sacat=0

https://www.ebay.com/sch/m.html?_odkw=2x...0&_sacat=0