Recommended · for some experience
Minifying the Arduino - [Anything Arduino] (ep2)
Why people recommend it
Walks through running an ATmega328 on a breadboard with a resonator as a minimal Arduino, recommended for cutting cost on permanent projects.
Watch for: one viewer hit servo trouble following the clock setup
In their words
Please check: [video] 5:56 min schematics is same as in picture...
Vladimir on electronics.stackexchange.com, Mar 2017. CC BY-SA.