WordPress is the most used CMS platform of all time.
Because you can setup good website within minutes, and edit it without any difficulty.
Here is the list of the top WordPress themes:
1. Shapely theme is the most popular theme that is responsive on all devices.
2. IIIdy theme is on trending right now
3. Tyche theme is one of the best for selling
4. IsleMeg theme is best for bloggers
5. Creativo theme is good for a personal blog if you want to build one
If you can't decide what hosting or domain service should you use, read a bit in previous post.