If you are looking for a one-stop, single best resource, I recommend the ESV Study Bible. It is overall, the best study bible on the market, with helpful contextual notes on the passages, pertinent articles and commentaries, and it’s introductions to each book of the Bible alone is worth more than the price of the book itself.
Oh, and it’s 50% right now (most versions at least).
So if you haven’t already, pick up a copy today! And maybe buy one or two for those in your life who are looking, or wanting, to be able to read and understand the Bible for themselves.