The best thing I can recommend for anyone with a real love for the Bible is to learn the original languages—Biblical Hebrew and Koine Greek.

Hebrew

A still widely-used Hebrew Grammar is Jacob Weingreen, 1959. A Practical Grammar for Classical Hebrew, 2nd ed. Oxford University Press. First published 1939. It gives a solid grammatical foundation, and if you can work your way through the entire book, you will really have good enough Hebrew to do a PhD in Hebrew Bible.

An answer key to the exercises in the book can be found here.

Another excellent and thorough resource I find myself returning to for finer grammatical points is called unfoldingWord Hebrew Grammar.

Hearing the Hebrew language is so important. This YouTube channel Aleph with Beth is incredible for that, and her series of videos starts at the very beginning, with the utmost basics.

For personal devotional study, the Hebrew concordance that can be found both on biblehub.com and blueletterbible.com are super, and give some background.

For intermediate to advanced study, the HALOT (Hebrew and Aramaic Lexicon of the Old Testament) is the most in-depth, and there is a huge pdf to be found online (which I cannot locate at this moment).

Greek

(More to come)