The Biblical Languages
The Old Testament was originally written in Hebrew with a few passages in Aramaic. The New Testament was written in Greek - specifically Koine Greek, that is, the common Greek of the time.
Most of us rely on translations. People (generally teams of people) proficient in the original languages have done their very best to express the meaning in English. We can be very grateful but there is, of course, an advantage in being able to see what was written in those original languages. Often there are nuances that are hard to convey in the English.
We have basically three options:
Just stick with the English
Stick with the English but use tools that explain the original languages.
Learn one, or both, (or all three) of those original languages.
Tools To Help Understand The Languages
Tools To Help Understand Hebrew
Tools To Help Understand Greek
Paid Courses
Bible Study Greek - Bill Mounce. This course helps you learn Greek well enough to do Greek words studies etc. without having to fully learn Greek.
Learning The Languages
Why Learn The Original languages
Why Study Hebrew?
Why Study Biblical Hebrew? - Zondervan Academic
Why Study Greek?
Learning Hebrew
How To
7 Tips For Learning Biblical Hebrew From Mile Van Pelt - Zondervan Academic
Websites
Learn Biblical Hebrew - Logos.com - linked to the use of the Logos Bible software but with free videos etc on this page
Paid Options
Master OT Hebrew - Biblical Mastery Academy
The Department of Biblical Languages - Israel institute of Biblical Studies
Learning Greek
Websites and Web Pages
Learn Biblical Greek - Logos.com - linked to the Logos Bible software but free videos etc on this page
Lingua Graeca Per Se Illustrata - Seumas Macdonald. Non-biblical Greek text that gets increasingly harder but provides practice in reading Greek. Macdonald says that it is not yet useful for learning Greek by yourself but he hopes it will be one day.
Hellenistic Greek - Michael Palmer
Paid Options
Learn Biblical Greek - Bill Mounce.
Greek Mastery - Biblical Mastery Academy
The Department of Biblical Languages - Israel institute of Biblical Studies
A Sample of the Bill Mounce course videos - Zondervan