If you use the TinyUSBboard as USBasp programmer on a regular base it could be useful to make the setup more permanent.
Liberate your breadboard
A sketch with Fritzing showing the connections including the 4MHz rectangular clock at PB1 (see also: info about 4MHz rectangular clock) and a 0.10 uF capacitor (marking 104) on vcc and gnd.
The board allows placement of both the rev3, rev3 THT DIY PCB and the rev4 TinyUSBboards.
|rev3||rev3 THT DIY PCB||rev4|
Stick some foam (double sided tape ... the same as under regular breadboards) to the bottom to protect the board from shorts while using on the workbench.