Domain

Unique address of a website
A domain is a unique address that identifies and allows access to a website on the Internet. For example, website addresses such as google.com and amazon.com are domains. Users can easily remember and access the website address with just the domain name without having to remember the IP address.
Two main parts that make up a domain
Top-level domain (TLD) – Extension format such as .com, .org, .net
Second domain – The core name part of the domain, such as google, amazon, etc.
Example
example.com
example is the second domain and .com is the top-level domain.

Domain registration
Domains can be purchased or registered through domain registrars. Examples include GoDaddy, Namecheap, and Google Domains. HostingKR (HK, hosting,kr)
Check domain registration cost
If you purchase a domain from a web hosting service provider, you can skip DNS settings

SSL (Secure Sockets Layer)

A protocol that provides an encrypted connection between a website and a browser to enhance security
SSL is a security protocol for safely transmitting data on the Internet. It provides an encrypted connection between a website and a user’s browser to prevent data eavesdropping or modification, and allows the user’s personal information or payment information to be safely exchanged (to prevent data from being intercepted or modified in the middle)

SSL Certificate
A website with an SSL certificate proves that it is a trustworthy source
HTTPS – A website with SSL applied is displayed as HTTPS instead of HTTP. The ‘s’ in front of http:// indicates a secure connection.

(A browser warning message is displayed for websites without an SSL certificate)

Currently, a more secure protocol called TLS (Transport Layer Security) has replaced SSL, but the term SSL is still commonly used.

https://aws.amazon.com/ko/compare/the-difference-between-ssl-and-tls/

PHP (Hypertext Preprocessor)

A programming language that creates dynamic web pages that run on a server
PHP is an open source language that is mainly used for web development as a server-side scripting language. It is used to create dynamic web pages or process data on the server (combining HTML code and PHP code to create dynamic web pages requested by the user).
For example, when a user fills out and submits a web form, PHP can process the form and dynamically output the results.

PHP runs on a web server and what the user sees is the HTML output (the PHP code is not directly visible to the user and is processed by the server).
It can be linked to various databases such as MySQL, PostgreSQL, and SQLite to store, retrieve, and modify data.

Web Hosting Providers

There are web hosting companies that provide various services necessary for individuals and businesses to host websites (Bluehost, HostGator, SiteGround, GoDaddy, FastComet, etc.) and comprehensively support domain registration, DNS management, hosting services, SSL certificate provision, PHP support (WordPress hosting, etc.) required for website operation.

cPanel
A web hosting management dashboard provided by web hosting companies as a basic management platform, a tool that helps you easily perform various tasks related to website management through a user-friendly interface

Various types of web hosting management panels (Web Hosting Control Panels) or hosting management systems (Hosting Management Systems)
cPanel, Plesk, DirectAdmin, ISPConfig, Webmin, etc.