That duplicate question is not outdated - everything in it is still true. The way you include styles in email (what you asked) has not changed at all - what styles you put in may have, but that's a different question. I'd suggest you look at an email CSS framework like Zurb's Foundation for email.
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PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license. https://www.php.net/
CSS (Cascading Style Sheets) is a formal language for describing the appearance of a document written using a markup language.
It is mainly used as a means of describing, decorating the appearance of web pages written using HTML and XHTML markup languages, but can also be applied to any XML documents, such as SVG or XUL. https://www.w3.org/TR/CSS/#css
Foundation, similar to Bootstrap, has become very popular as a more complex framework with some advanced but easy-to-implement CSS components. It is built with Sass, so just like Bootstrap, it is customizable. In addition to this, it also boasts some features that help make the design mobile responsive. https://get.foundation/
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone. https://www.w3.org/html/
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