How to make Topic clusters

What tools do you use to make topic clusters? What does it mean? In my site I am just writing content that is low competitive and adding them to their respective categories. Currently, I have 4 categories on my site. There is no pillar page/content on my site. All the articles related to the category only.

I use Writerzen

Bloodseeker said:

I use Writerzen

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What is so special about Writerzen? I don't have any pillar pages so, will making topic clusters effective for my site in SEO?