The post is more about my path towards the top 100.

But to begin with you need some computer connected to the internet. The blockchain assigns a few blocks to witnesses outside the top 100 so it is not profitable to “mine”, but it interesting.

You then need to do your campaign to get votes. You can grow as a witness having a low Hive Power yourself if you get enough votes, or you can buy Hive Power to grow, which would be quite a big investment.