[akshat_h]

This is kinda similar problem to the advice given of "Build Something" given to new programmers. For a long time, I thought that meant "Build Something completely new and fascinating" and I would spend days trying to find something to build, see examples of it already present and give up. Recently I have realized it doesn't really matter. Sublime text had the first release in 2008, a time when I would have said Text Editor market is saturated. Visual Studio Code was released even more recently, and still gained sufficient market share. Now will you write the next Sublime text? Probably not, but that doesn't mean writing a new text editor, music player, heck even a todo app is a bad endeavor to learn. And it'll be really hard to write sublime without writing a notepad clone.

My main point here is, even if you are writing about the most mundane topic, in CS there is bound to be something, a different command line flag, a different point of view, something old rediscovered etc. just by the virtue of writing on it. Will it happen on your first attempt? Probably not.

You can start to write about the most mundane or the most esoteric thing. Only with practice would you find a niche, and there eventually will be some gems.