Where can I find a base for developing circuits and topological solutions on AVR and STM microcontrollers?

Question

Electronics

For a couple of years I have been making circuits on AVR and STM, but so far I have not gotten beyond copying the reference designs of debug boards. With this approach, it is quite difficult to debug the circuit. Tell me, where can I study the intricacies of circuitry and topological layout of circuits for microcontrollers from scratch?

Answer 1

On "circuitry" - to study circuitry. For example - Harris and Harris or Horowitz and Hill.
According to "topology", for example, this is: caxapa.ru/lib/emc_immunity.html