The lyrics of There is a Fountain Filled With Blood, written by William Cowper, and a history of how the song came into being. Link here.
A blog post can only introduce a topic but not cover it in depth. For more study on various topics, click here for links to various Christian ministries.
Depending on the ministry, there may be online church services, YouTube videos, podcasts, radio programs, books, teaching, or more. You have to seek out what they have.