[NTG-context] Abstracting styles

Hi, I’m trying to learn ConTeXt, but I’m discovering a few hurdles along the way. Essentially what I currently want to do is to emulate paragraph styles found in other software, e.g. Scribus. After several hours of research all I have in my head is a complete mess of conflicting approaches, so I’d like to get some sane present-day advice. :-) Say I wanted to achieve this (as a rough example, the point is mixing weights and OpenType features in different contexts): Heading 1: Source Serif Semibold, smcp=yes, 12% letter-spacing Heading 2: Source Serif Semibold Emphasis: Source Serif Regular, smcp=yes, 8% letter-spacing What is the most straightforward way should I load the fonts and set the ‘styles’? Thanks!