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Welcome to the arduino project wiki!

Here I'll start collecting answers to my own questions

arduino-cli

1. I bought a cheap arduino nano, which arduino-cli didn't recognized.

When I ran

arduino-cli board list

it returned

Port         Type              Board Name  FQBN            Core       
/dev/ttyUSB0 Serial Port (USB) Unknown 

After searching for a while I found how could I upload code to it in this issue answer, whicn was important to me because that made my brick style arduino at that moment alive.

I only had to change my upload command from:

arduino-cli upload MyFirstSketch.ino -b arduino:avr:nano -p /dev/ttyUSB0

to

arduino-cli upload MyFirstSketch.ino -b arduino:avr:nano:cpu=atmega328old -p /dev/ttyUSB0

which uploaded my first sketch to that board!