"Trendwhore", seriously? Anyway, this article isn't talking about people aspiring to make major contributions to high-profile highly-complex projects, it's talking about people who want to contribute to projects in general, and saying that small less-technical contributions are great to start with.
And it's not that easy to find a project, especially not for inexperienced developers. You don't want to pick an unmaintained project - you need somebody around to help you when you get stuck, ideally at least a few people so that you don't burn them out on answering questions. Hopefully you manage to find a project that has reasonably friendly people, some way to talk to them, a language you're familiar with, relatively easy tasks to get started with, and is interesting to you in some way - not really a simple Github search.
And it's not that easy to find a project, especially not for inexperienced developers. You don't want to pick an unmaintained project - you need somebody around to help you when you get stuck, ideally at least a few people so that you don't burn them out on answering questions. Hopefully you manage to find a project that has reasonably friendly people, some way to talk to them, a language you're familiar with, relatively easy tasks to get started with, and is interesting to you in some way - not really a simple Github search.