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All of these tutorials are also published on the planet-libre.fr site, which lists the RSS feeds of many free blogs.
It is therefore an article dealing with free, in the context of Raspbian or Raspberry Pi.

How to plug in and use a GSM SIM800L module with the Raspberry Pi (without battery).

Activate the TTL serial port of the Raspberry Pi and verify that it is working.

Raspberry Pi Imager, the foundation releases an official tool to install an OS on the Raspberry!

Create an SD card from Windows, Mac or Linux with Raspberry Pi Imager.

The price of the Raspberry Pi 4 version 2 GB of RAM drops to $ 35!

How to activate SSH on the Raspberry Pi.

Use a domain name with the Raspberry Pi to make it accessible from the internet.

Give a fixed local IP to your Raspberry Pi.

Turn off the camera LED for Raspberry Pi.

Connect to the Raspberry Pi without internet with the serial port.