Since a year, I don't use PowerPoint anymore. I instead enjoy using HTML and CSS to create my slides with reveal.js.
Learn step-by-step how Web Components work and how to use them. Including HTML templates, custom elements, shadow DOM, attributes, properties, and slots.
HTML 5 added a set of new HTML tags known as "semantic" tags to better structure websites. You should use them to avoid sinking in chaos with many levels of nested divs. They also have the benefit to make your website more accessible.
