Connect to wifi from command line on linux systems through the iwd (wireless daemon for linux)

The iwd is the up-and-coming wireless daemon for linux released by Intel and the wpasupplicant successor. The development of iwd is still in progress , but it is packaged under some linux distribution Gentoo, Arch-linux , Ubuntu (Cosmic) and Debian (Buster and Sid)... The configuration of the network and the connection is possible through the interactive mode using iwctl , the help command will display the list of the available commands (no manpage ). Without using the interactive mode : 1) How can I manually configure the wifi credentials? 2) How can I connect to the configured wifi through iwctl? 3) How can I automatically enable the wifi connection at boot?