The bible was written by men who lived as much as 6,000 years ago. It tells of eternal truths, truths that never changes but by men who thought and acted in a different time. We need know what the words they used meant to them in order to learn the eternal truths the bible speak of.
Also, the one who actually gave the substance of the bible is a spiritual being, not a mortal man. This spiritual God used man to put down God's thoughts. Sometimes these thoughts are put down exactly and we are told "God said" but sometimes he is putting God's thoughts in language he understands. We need to note the difference.
Something else we need to be aware of is that most of those who put down the thoughts of God used the Hebrew language to put them down. If they didn't write them, originally, in Hebrew they were men who had studied God's word in Hebrew. So sometimes you need to understand some key words of Hebrew like Shalom or Torah. These words can't be accurately transcribed into another language. As an example the word Torah is usually transcribed as law and law is a very inadequate translations that lacks much in meaning.
The men who wrote down what God told them sometimes uses saying that were completely understood at the time but have been lost over the years. As example is "an eye for an eye and a tooth for a tooth". It is like our saying "don't burn you bridges" that has nothing to do with bridges. We need to spot these saying, so for example we know that scripture is talking about justice, not about taking out eyes or pulling teeth.
Also, it is a wonderful help to read with an explanation of scripture that consists of using history and all of scripture to explain, not his personal interpretation. Hard to find but possible. The OT is fulfilled in the NT. God did not divide his word, man did. So this commentary needs to include showing how the testaments work together.
We need to know all scripture works together, one verse never makes another verse not true any more. Many changes happen over the 6,000 years of scripture. For instance Christ's blood was only symbolically given for 4,000 years, but we need to keep our minds on what didn't change. The giving of blood is required for our salvation, that didn't change. A good commentary would point this out.
So with these truths in mind, you are off into learning the most important, fascinating, and wonderful things that any study can be.