HTML5, Responsive Design, CSS, Frameworks and all matters related to building a website.
Paragraphs help writers to order and organise their thoughts, give the reader 'rest points' as they work through the text and provide us entry and exit points into documents – shortcuts for navigating around text. On the web, a smaller paragraph is best.
Designers need to stop and really look at the often horrible state of cards as used almost everywhere on the web and in apps.
From Google, Twitter and almost any hand-rolled website there are designers who think that they are on the bleeding edge of UX. They've preached the benefits of cards — those boxes of content wrapped in often rectangular boxes of padding and borders — for so long, that everyone believes it's the chosen path of UI.