It is a very good video about Blogger Article Keywords.
It is explained in simple English. You feel that you are hearing in your mother tongue.
After watching this video, you will be confident as to how to use and where to use the keywords in blogger.
Youtuber explained about three systems
- Keywords Anywhere.
All above are free
But, there is also paid version in Ubersuggest. But, it is not necessary for a beginner. You can go for paid premium version only when you have got affordability through Blog earnings according to me.