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Hello everyone, today I'm going to make serial posts about the collection of articles on GNU / Linux collected from the Internet, I'll try to find articles or blog post about the world of Open Source and GNU/Linux to choose according to my opinion of course.

Selected articles are, in fact for my own learning interests. I will try to summarize and provide good resources as well by accompanying the link to the original sources. I hope that the resources can be useful to me as well as to both of Open Source and GNU/Linux users.

### 1. [Three Command Line Tools to Install Local Debian (.DEB) Packages](https://www.tecmint.com/install-local-deb-packages-in-debian-ubuntu-linux-mint/)
You will learn how to install applications using Command Line Tools (CLI) on Linux operating systems especially Debian derivatives. You will be guided on how to install applications with tools such as `dpkg`, `apt` and `gdebi`.

For newly-emerging Windows users to Debian or Ubuntu, the most common problem is about installing applications on newly-used operating systems, and of course very different from the frequent application installations on the Windows operating system.

You will focus on how to install applications using terminal in this article. 

### 2. [How To Remove Password From A PDF File in Linux](https://www.ostechnix.com/how-to-remove-password-from-a-pdf-file-in-linux/)
We often find articles or documents in PDF (Portable Document Format) format which is protected by a password, usually, this is done for security reasons so that the content contained in it is not misused. In this article, the author will explain four methods how to remove the password contained in a PDF file using Linux operating system.

### 3. [Downloading an Entire Web Site with wget](https://www.linuxjournal.com/content/downloading-entire-web-site-wget)
In this third article, you will learn how to download the entire website by using the `wget` command, a tool you can install through a terminal on Linux. perhaps to be read offline, or to perform a security inspection of a website, the negative effect is that it can be exploited by irresponsible people as part of a phishing plan, however, this article still worth reading.

### 4. [How to install the Moodle learning management system](https://opensource.com/article/18/4/how-install-moodle-learning-management-system)
For educational practitioners, creating an online course will certainly be helpful for achieving a larger audience to spread the knowledge that is mastered by a teacher. Moodle is a content management system (CMS) that can be used to share learning materials, administrative assessment and can also be used as a tool for tracking students' learning.

This tutorial is very suitable and good to try for educational practitioners who want to create a learning management system.

### 5. [Reset a lost root password in under 5 minutes](https://opensource.com/article/18/4/reset-lost-root-password)
The fifth article is about how to reset the forgotten root password in Fedora, CentOS or other Linux distros. This guide will be very useful for a system administrator who wants to change a forgotten root password or if at any time the old admin leaves the company, you should try this guide, it less than five minutes.

Thus the five Linux resources that can be used and practiced including CLI tools, removing passwords from PDF files, download the entire website, how to use Moodle as learning management system and the last about how to reset the forgotten root password.