If you are not familiar with Linux (for example, you're working on Windows or mostly doing web-development), it could entirely be. Mac OS is more friendly, but I certainly saw many developers that didn't scratch the surface and directly went with XCode/ObjC/iOS. In that sense, you can build a career without ever considering OSS development/usage.
What's best for somebody that, as of now, is questioning which project should be looking at? If you don't know what you're looking for, any advice is just as good as a google or github search (ie: useless).
If you start by having fun, even by publishing your random projects, you will be dragged in by dependencies (that's ironic). I would rather recommend choosing something fun to work with than a random project to look at.
What's best for somebody that, as of now, is questioning which project should be looking at? If you don't know what you're looking for, any advice is just as good as a google or github search (ie: useless).
If you start by having fun, even by publishing your random projects, you will be dragged in by dependencies (that's ironic). I would rather recommend choosing something fun to work with than a random project to look at.