I want to start helping with stuff, is it best to choose from a list like this? or something you like but doesn't really need help? or is there somewhere central where people ask for help.
Probably good if you chose a project you personally/professiobally use and thus know it from an end user perspective, eat your own dog food etc. Good also if you're been interested in the area longer so you're sure you want to work with it long term.
