It shouldn't be a problem, if you want to write something just do it! Just avoid to write statements about things you don't know. Start your article by saying

It shouldn't be a problem, if you want to write something just do it! Just avoid to write statements about things you don't know. Start your article by saying that you are a beginner and for things you don't know, give open questions instead. You can also learn one simple thing well and do a post about it, or you can try something new and write a tutorial about it with a few conclusions of your experience. For instance how to do a simple web app with React, Flux, and Node.js. So there are still things you can write, just be open about your level and what you don't know, and write about what you learned. And even trivial things can be useful for others (like simple stats for devs, or simple python code for data scientists).