Please choose the language you want to learn to debug with. We offer:

• Javascript: in-browser debugging using the Firefox Developer Tools
• Python: debugging a terminal python script using the build-in PDB
• Ruby: debugging a terminal ruby programme using pry

Unclear what debugging is about? You can find Ben's presentation here:

http://slides.com/benjaminkampmann/debugging-101/live#/

(To navigate through the slides: always go down if possible. If not go right once. Repeat.)