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Generally, OpenSSL is used for CSR generation on Linux-based web servers (Apache or Nginx) So, if the default web server is installed, there should be no issues with using OpenSSL as it is installed by default on these web servers.

The RSA key algorithm is the algorithm most widely used in digital security. It's an asymmetric cryptography algorithm. This basically means that there are two keys involved while communicating, i.e., the Public key and Private key.

Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board. To do so you use the Arduino programming language and the Arduino Software (IDE).

An Apache web server can host multiple websites on the SAME server. You do not need separate server machine and Apache for each website. This can be achieved using the concept of Virtual Host or VHost.
Any domain that you want to host on your web server will have a separate entry in Apache configuration file.

Swap space is the area on a hard disk. It holds memory pages that are temporarily inactive. Swap space is used when your operating system decides that it needs physical memory for active processes and the amount of unused physical memory is insufficient. When this happens, inactive pages from the physical memory are then moved into the swap space, freeing up that physical memory for other uses.

Apache or Apache HTTP server is a free and open source web server, developed and maintained by the Apache Software Foundation. It is one of the most popular web servers in the world. Apache allows website developers to serve their content over the web and provides many powerful features that can be extended through additional modules.

Previously, we explored the fundamental concepts and terminology utilized in Domain Driven Design (DDD), as well as the layers that make up its architecture. In this section, we will examine the artifacts employed to integrate these concepts and construct our application, using PHP as an example.

Developing applications that can perform complex tasks can be a challenging process, and it requires careful planning and design. One approach to managing this complexity is to use a Layered Architecture. This architecture separates the application's code into layers, each with a specific responsibility and purpose. These layers are typically organized in a hierarchy, with higher-level layers depending on lower-level layers.

Domain Driven Design, or DDD, is a software design approach that emphasizes solving business problems and organizing the corresponding logic, rather than focusing on details such as programming languages or infrastructure technologies. The primary goal of DDD is to map real-world systems or processes into software artifacts. In order to enhance our comprehension of the fundamentals of DDD, let's take a closer look at some crucial concepts.

Symfony is a PHP web application framework and a set of reusable PHP components/libraries. Symfony aims to speed up the creation and maintenance of web applications and to replace repetitive coding tasks. It's also aimed at building robust applications in an enterprise context, and aims to give developers full control over the configuration: from the directory structure to the foreign libraries, almost everything can be customized.

Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.

I will share with you some very useful native HTML tips that does not need any CSS nor JavaScript.