Work and experience that relates to the online job in question. There's no 'one size fits all' when it comes to skills and experience for any and all projects.
I suppose you could say hard working, conscientious, organized, determined, good at meeting dealines etc etc... but I guess they're more attributes or strengths than specific demonstrable skills. But everyone is usually going to say they have those attributes anyway, whether they do or not... like how they work well in teams or on their own, and they like going to the cinema and socialising.
I got an onsite gig once where the guy asked me my weakness and I said punctuality. Yep, showed up at 9:15am every day and I guess he couldn't complain.
I love interviews.