You should also set the “Anyone Can Register” in Settings/General to off, and you should have some sort of spam plugin. Akismet is the old standby, the one I use, but there are many of them these days.
Another popular blog platform is the wordpress platform. WordPress started out in 2003 and is an open source platform. Open source is code that is basically a collaboration with many coders and programmers. No licensing is required and anyone can freely use and modify the code to improve usability or add features. This has resulted in WordPress being the most customizable platform and added to its popularity.
However, once you know better what you are doing and where you want to go with your blog, and especially if you want to make money from it, or run a serious hobby or interest blog, then you don’t really have an option. The choice of which WordPress to use comes down to dot Org.