The first Arduino was serial, and over the decade and a half, this has been the default way to upload code to an Arduino board. In 2008, support for in-circuit programmers was added, and later port… ...

One to note for Arduino command line users: a new version is out, with Arduino CLI 0.19.0 now available. In a nutshell, the CLI is Arduino's Command Line Interface application, for coding, compiling ...