WordPress version 5.0 came out a few weeks back at this point. I have upgraded most of my sites to the latest version. It has some pros and cons, but overall it was not a big change except for the new Gutenberg editor. This is what my experience was during the upgrade.
WordPress runs about 30% of the websites on the internet in 2018, more than any other single blog or website system. It is a good choice in a content management system for many people because it has a lot of features that can be changed around easily to build a unique website.
Why would anyone want to hack you? The answer almost always comes down to money. Hackers are not targeting you, they are targeting the websites that have weak security. These are a few common types of hacks that I see on WordPress sites, and the motivation behind them.