Friends, I still do not know how to install .deb files and .rpm I want to install Skype but I do not know how to do it.
Help

The recommended way to install Skype:
From the desktop menu, open ControlCenter.
In ControlCenter, click the"Network" tab then click"Meta Package Installer".
In Meta Package Installer, scroll down to find"Network" and
click the >left-side triangle to expand that category.
You will see"Skype" listed there, tick the checkbox and click"Install" button.

To handle installation of .deb files that you have downloaded, you can
sudo apt update && sudo apt-get install gdebi
After installing"gdebi", when you browse in file manager (rox-filer, spacefm, etc) to a directory
containing the debfile, if you right click and choose"open with gdebi", the gdebi app it will first check dependencies then offer to install it.
-=-
Alternatively, from a terminal emulator prompt, you can install by commanding
sudo dpkg -i /path/to/the/debfile.deb


To handle .rpm files, you can sudo apt-get install install alien
then man alien to read the manpage documentation describing how to use it.
Note: installation of .rpm packages is _not_ recommended
Before attempting to install an .rpm, launch synaptic package manager and search
~~ a native debian-packaged version of the program may be installable from the debian repository.

I do not see Skype in the meta package

oops, sorry for my typo. The skype entry is displayed in the"Messaging" category (not"Networking").

Woow thank you very much, I appreciate it from the heart