1. Be sure to disconnect all cables for your
microcontrollers before throwing them into a shopping bag. Trying to re-solder a
torn off micro USB surface mounted socket is difficult and might be impossible
if you can't even find the torn off socket.
2. Check to see which Arduino chip you are using.
Though the ATmega328 and 168 look identical, the programmer will balk at you if
you get mixed up. A jewelers loupe or small electron microscope are useful for
reading the number of the chip.
3. By default, the first time a Raspberry Pi runs
- it launches raspi-config. This is useful to know in case you need to
reconfigure the OS, to expand the disk space, turn on ssh, etc., the next
time you start the device.