https://learn.sparkfun.com/tutorials/installing-an-arduino-bootloader
This one is expensive and does not work most of the time. Not easy to find good but cheap burners. I failed in a few burners so was never successful.
https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard
This one also failed last time, but I managed to make them work by putting a 1microF electrolytic capacitor at the reset pin of the programmer Arduino board. In my case a UNO Arduino clone.
Now the documentation is much better but there is no mention of the reset pin problem so be careful.
http://3g1l.com/blog-burn-bootloader-blank-atmega328atmega328p-arduino-uno
It can solve the reset pin problem but you need to run another sketch.
https://www.youtube.com/watch?v=dpgcBsl9D4k
This is probably the most flexible but also more complicated.
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