These are the tools and components I recommend and personally use for handwired and PCB keyboard builds. Some are available on ScottoKeebs and others are Amazon affiliate links.
TS101 Soldering IronBuy on Amazon
A great temperature controlled soldering iron that can be powered off a battery.
D24 Chisel TipBuy on Amazon
A better tip than the one included with the TS101. It allows you to distribute heat more evenly.
63/37 SolderBuy on Amazon
Leaded solder with a flux core that makes it super easy to wire up any keyboard.
Soldering MatBuy on Amazon
You definitely don't need this but it makes life so much easier by helping stay organized.
Wire StrippersBuy on Amazon
Expensive, but worth it if you work on a lot of handwired builds.
Flush CuttersBuy on Amazon
These allow you to get a really close cut to PCBs, controllers, or copper.
Electric ScrewdriverBuy on Amazon
This screwdriver makes it a lot easier and faster when assembling.
MultimeterBuy on Amazon
Great for checking continuity on both handwired and PCBs.
Ender-3 ProBuy on Amazon
A workhorse of a 3D printer with many paths for upgrades such as auto leveling.
Sonic PadBuy on Amazon
Allows you to use Klipper firmware for better and faster prints on most Creality printers.
Textured PEI BedBuy on Amazon
PEI allows PLA to stick better to the bed and results in less failures overall.
Auto LevelingBuy on Amazon
Adding auto-leveling to a 3D printer will result in more successful prints with better quality.