ESP32 Thing Hookup Guide
The ESP32 Thing ships without anything soldered into the header pins -- ensuring that you can mold the board to best fit your project. To use the chip's pins you'll need to solder something to the I/O and power rail vias broken out to either side of the board.
What you solder to the ESP32 Thing's I/O pins is completely up to you. The header rows are breadboard-compatible, so you may want to solder male headers in. (Mildly satisfying: the ESP32 Thing's pair of 20-pin headers means you can get the most out of our 40-pin header strips.)
Then plug it into the breadboard, hanging the USB and LiPo connectors off the end, and start wiring!
Alternatively, female headers (you may need two separate strips to solder all 40 pins), right-angle headers, or stranded wire are all good options, depending on your project's needs.