This is a great question. The Bible is such a fascinating book. It is God’s word, and it is filled with wonderful stories, history events, divine revalation, and so much more. It is also a very large book, because it is actually composed of many shorter books, yet it flows together so well. So what is the main point of the Bible?
In my opionion, if you want it on one word it is LOVE.
Love God with all your heart, all your mind, and all your soul. Also, love people. Simple as that. Control your emotions, control your temptations, and LOVE–everything else is just details!