One of the greatest contributions of Andrew Steinmann's Intermediate Biblical Hebrew is the time he takes to guide the student-in-transition to note and distinguish common words and words that are confusingly similar to the seminarian new to Hebrew. That would have been incredibly helpful and encouraging as part of my first-year Spring Biblical Readings Class!
The author/editor of this book is also the author of the Concordia Commentary on Ruth. This is a similar, yet distinctly focused kind of exegetical help. The website description is a good summary of what to expect. Not a mere grammar for Ruth, expect history and theology as you prepare to preach and teach this remarkable Christological book.