Linux – List installed package/s and its/their details [New Question]

See the new question, answered, on Heelpbook, titled:

Linux - List installed package/s and its/their details

Summary
Article Name
Linux - List installed package/s and its/their details
Description
A quick question, answered on Heelpbook, about "Linux - List installed package/s and its/their details", a useful activity also to extract needed packages installed on Linux and backup the list for future reference.
Author
Publisher Name
Heelpbook.net