A Content Management System (CMS) is a software application that provides website authors with tools to manage the creation and modification of digital content. It helps manage and organize the content of a website without requiring manual coding.

With a CMS, users can create, edit, publish and manage various types of content, including text, images, videos, and audio, using a simple graphical user interface, rather than having to write code directly. This allows non-technical users to maintain and update a website with ease, saving time and resources.

Some popular examples of CMS include WordPress, Joomla, Drupal, and Wix. These systems offer a range of features, from basic website creation tools to more advanced options such as e-commerce and multimedia management. The choice of a CMS will depend on the specific needs of a website and the skill level of the users.

- WordPress: https://wordpress.org/
- Joomla: https://www.joomla.org/
- Drupal: https://www.drupal.org/
- Wix: https://www.wix.com/
- Shopify: https://www.shopify.com/
- Magento: https://magento.com/
- Squarespace: https://www.squarespace.com/

https://www.youtube.com/watch?v=nrbpOmNC_mM

Cross-Origin Resource Sharing (CORS) is a mechanism that allows web pages to request resources from a different domain than the one that served the web page. This is a security feature that restricts a web page from making requests to a different domain than the one that served the page.

CORS works by adding HTTP headers to the server's response, which indicate which domains are allowed to make requests to the server. The browser then checks the response headers before making the request, and will only continue with the request if the response headers indicate that the request is allowed.

For example, if a web page served from "example.com" wants to make a request to "api.example.com," the server at "api.example.com" needs to include the appropriate CORS headers in its response. The headers might look something like this:

```
Access-Control-Allow-Origin: https://example.com
Access-Control-Allow-Methods: GET, POST, PUT
Access-Control-Allow-Headers: Content-Type
```

In this example, the headers indicate that the server at "api.example.com" is allowing requests from "example.com," and the allowed methods are "GET," "POST," and "PUT."

CORS is an important security feature, but it can also be a source of frustration for developers who are trying to make cross-domain requests. If the appropriate headers are not included in the server's response, the browser will block the request and the user will see an error.

- MDN Web Docs: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS

- W3Schools: https://www.w3schools.com/xml/ajax_cors.asp

- HTML5 Rocks: https://www.html5rocks.com/en/tutorials/cors/

- Tutorialspoint: https://www.tutorialspoint.com/html5/html5_cors.htm

- Enable CORS: https://enable-cors.org/

- YouTube tutorials: There are many video tutorials available on YouTube that cover CORS, you can search for "CORS tutorial" or "CORS with [your preferred programming language]" to find relevant content.

I hope these resources help you learn more about CORS and how to implement it.

https://www.youtube.com/watch?v=tcLW5d0KAYE

Customer Relationship Management (CRM) is a strategy used by businesses to manage interactions with current and potential customers. The goal of CRM is to improve customer satisfaction, loyalty, and retention by streamlining and organizing communications and data across departments, such as sales, marketing, and customer service.

CRM systems typically include software tools that help companies manage customer interactions and data throughout the customer lifecycle, from marketing and sales to post-sales support. This information is stored in a central database, allowing businesses to track customer interactions and better understand their needs and preferences.

By using a CRM, businesses can improve the efficiency of their sales and marketing efforts, build stronger relationships with customers, and gain valuable insights into customer behaviour or and purchasing patterns.

- Salesforce - a leading CRM provider, with information on their products, solutions, and resources for businesses: https://www.salesforce.com/

- Gartner - a research and advisory company, offering insights and analysis on the CRM market and solutions: https://www.gartner.com/en/information-technology/glossary/customer-relationship-management-crm

- Hubspot - a leading inbound marketing and sales platform, with resources and information on CRM and related topics: https://www.hubspot.com/customer-relationship-management

- Zoho CRM - a cloud-based CRM solution, with information on their features and how they can help businesses: https://www.zoho.com/crm/

- Wikipedia - a comprehensive overview of CRM, including its history, concepts, and implementation: https://en.wikipedia.org/wiki/Customer_relationship_management

https://www.youtube.com/watch?v=SlhESAKF1Tk

HTML, or HyperText Markup Language, is the standard markup language for creating web pages and other information to be displayed in a web browser.

HTML uses a system of tags and attributes to define the structure and content of a web page. For example, a paragraph of text might be enclosed within the "p" tag, while a header might be enclosed within an "h1" tag. The tags and attributes in HTML provide information to the web browser about how to display the page and its contents.

HTML has evolved over time, and the latest version, HTML5, includes new features such as video and audio playback, improved support for mobile devices, and new semantic elements that make it easier to describe the structure of a web page.

https://en.wikipedia.org/wiki/HTML

https://www.youtube.com/watch?v=qz0aGYrrlhU

(CMS) Content management system