Roni talked in Finnish about theme development.
Original subject on the Meetup page: Räätälöity WordPress-teemakehitys — Näin rakennat teeman aloitusteemasta. Slides powered by reveal.js. This repository needs dude-reveal.js-base to work properly. The talk is in Finnish and the actual live slides can be found at slides.dude.fi/wpsjk-theming-wp/.