Solution 1:

Yes, it can. The question "Learning to ride a bike?" is an abbreviated way of asking the question, "Are you learning to ride a bike?" An article using that question as a title would likely contain things learners should know, like helpful tips and/or safety warnings. However, if the article is a how-to guide for people who want to learn but haven't yet (i.e., would-be learners), you would more aptly forego the question mark and use "Learning to Ride a Bike" as your title.