How do you decide the topic of your first blog post?

I wanted to start writing articles but was confused between multiple ideas on how to get started. In all such situations, I have always fallen back on creating something from my personal experience. To that end, here is my first article (a bit technical though) for anyone who is looking to crack a Data structure & algorithm interview with a big product company. There are N number of directions to go into when preparing for a technical interview. This guide is a summary of my experience and one single direction that can be taken which will give you results for sure without digressing from your path. It will save you time as you do not have to follow multiple resources online. Here is the article: https://dev.to/rahhularora/the-ultimate-guide-for-data-structures-algorithm-interviews-npo How do you guys decide what to write?