Cleansed and update able installation steps for Debian 11, codename "Bullseye":

Go to downloads:
$ cd ~/Downloads

We need to add a key that has been used to sign the packages of this coding platform. Otherwise, the system will not accept the VSCode repository to download the required packages:
$ curl -sSL https://packages.microsoft.com/keys/microsoft.asc -o microsoft.asc
$ gpg --no-default-keyring --keyring ./ms_vscode_key_temp.gpg --import ./microsoft.asc
$ gpg --no-default-keyring --keyring ./ms_vscode_key_temp.gpg --export > ./ms_vscode_key.gpg
$ sudo mv ms_vscode_key.gpg /etc/apt/trusted.gpg.d/

Add VS Code Repository on Debian 11:
$ echo "deb [arch=amd64] https://packages.microsoft.com/repos/vscode stable main" | sudo tee /etc/apt/sources.list.d/vscode.list

Run system update:
$ sudo apt-get update

Install Visual Studio Code:
$ sudo apt-ge install code

At this point you can remove the temporary installation files from Downloads:
$ rm -rf microsoft.asc  ms_vscode_key_temp.gpg  ms_vscode_key_temp.gpg~

Verify the installed version:
$ code --version
Current output:
1.66.1
End of current output.

Find the program in the Desktop Environment menus:
Just type in "vs"

Uninstallation (optional):
$ sudo apt remove code
$ sudo rm /etc/apt/sources.list.d/vscode.*
$ sudo rm /etc/apt/trusted.gpg.d/ms_vscode_key.gpg

References:
Web: https://www.how2shout.com/linux/ways-to-install-vscode-on-debian-11-bullseye-linux/
File: 2 Ways to install VS code on Debian 11 Bullseye Linux - Linux Shout.pdf
