The best way to understand the context of a book is to do an over view of that book. The reality is that is what the people who write the introductions and commentaries have done, or should have done.
If you can read, you have the ability to do this yourself. Further, Jesus promised help. Look at John 16:13. Then review 2 Peter 1:19 – 21. Note that men moved by the Holy Spirit spoke from God and one of the roles of the Spirit is to lead us into all truth. When is the last time you read or studied a book in the presence of the author? You can stop anytime and ask for clarification. The promise is He will lead you in that process.
That, by definition, is a really good deal.