We have a world of wealth in Christian teaching these days as prophesied by the Lord to the prophet Daniel, that in the end times, knowledge will increase. (Daniel 12:4) We also know that Satan prowls around looking to destroy (1 Peter 5:8) and to outwit (2 Corinthians 2:11) us with deception using the concept of "Did God really say.....? (Genesis 3)". If we listen to more than one teacher we can learn and get better understanding in some ways, but we will likely find some contradiction in theology.
We know that God is not the author of confusion (1 Corinthians 14:33) neither that we need to call out all those whom we disagree with as false teachers. As followers of Christ we should all be encouraged to make sure that whatever we are being taught and whomever we are learning from; local church, online teaching, small Bible study, prayer group, trusted friend, that we should always be good Bereans, study scriptures for ourselves, test everything (1 Thessalonians 5:21), ask for wisdom (James 1:5) and understanding (Psalm 119:125) and remember that the Holy Spirit will never teach us something that is contrary to scripture.
Listed below are some important verses from different translations, so look them up. The free online Bible links allow you to see one passage with several translations side by side as a handy study tool. Remember that warnings are not meant for condemnation, but to show us truth and strengthen us in our walk with Yeshua.
Be Good Bereans
Now the Bereans were more noble minded than the Thessalonians, for they received the message with great eagerness and examined the Scriptures everyday to see if these teachings were true. ~Acts 17:11, Berean Study Bible
Be on Your Guard
Therefore, loved ones, while you are looking for these things, make every effort to be found in Shalom, spotless and blameless before Him. Bear in mind that the patience of our Lord means salvation---just as our dearly loved brother Paul also wrote to you with the wisdom given to him. He speaks about these matters in all of his letters. Some things in them are hard to understand, which the ignorant and unstable twist (as they do with the rest of Scripture)---to their own destruction.
Since you already know all of this, loved ones, be on your guard so that you are not led astray by the error of the lawless and lose your sure footing. Instead, keep growing in the grace and knowledge of our Lord and Savior Yeshua the Messiah. To him be the glory both now and to the day of eternity! Amen. ~2 Peter 3:14-18, Tree of Life Version (TLV)
Beware False Teachers
False messiahs and false prophets will arise and perform great signs and wonders to lead astray, if possible, even the elect. ~Mathew 24:24, Holman Christian Standard Bible (HCSB)
Then finally they realised He (Jesus) wasn't talking about the yeast found in bread, but the error of the teachings of the Pharisees and Saducees."(the well respected religious leaders of the day) ~Matthew 16:12, The Passion Translation, (TPT)
But I am frightened, fearing that in some way you will be led away from your pure and simple devotion to the Lord, just as Eve was deceived by Satan in the Garden of Eden. You seem so gullible; you believe whatever anyone tells you even if he is preaching about another Jesus than the one we preach, or a different spirit than the Holy Spirit you received, or shows you a different way to be saved. You swallow it all. ~2 Corinthians 11:3-4, The Living Bible (TLB)
Study the Whole Word
In the beginning God created the heavens and the earth. The earth was formless and void, darkness was over the surface of the deep and the spirit of God was moving over the surface of the water. God said let there be light and there was light. ~Genesis 1:1-3, Modern English Version (MEV)
All scripture is inspired by God and is useful to teach us what is true and to make us realize what is wrong in our lives. It corrects us when we are wrong and teaches us to do what is right. ~2 Timothy 3:16, New Living Translation (NLT)
I have stored up your word in my heart, that I might not sin against you. ~Psalm 119:11, English Standard Version (ESV)
In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through Him, and without Him nothing was made that was made.... And the Word (Jesus) became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth. ~John 1:1-3, 14, New King James Version (NKJV)
Recognize the Holy Spirit
The helper, the Holy Spirit, whom the Father will send in my name, will teach you everything and make you remember all that I have told you (scripture). ~John 14:26, Good News Bible (GNB)
Dear friends don trust every spirit. On the contrary, test the spirits to see whether they are from God; because many false prophets have gone out into the world. Here is how you recognize the Spirit of God: every Spirit which acknowledges that Yeshua the Messiah came as a human being is from God, and every spirit which does not acknowledge Yeshua is not from God---in fact, this is the spirit of the Anti-Messiah. You have heard that he is coming. Well he is here now in the world already! ~1 John 4:1-3, Complete Jewish Bible (CJB) Note: The true Holy Spirit agrees with the Word and not the world.
This is a mere sampling. Find a good reading plan or make one. Phone Bible apps usually have them: Read the Bible in one year. The best ones use scripture from 2-3 sections each day. There is the Old Testament: Pentateuch (the Law), history, poetry, major and minor prophets and the New Testament: Gospels, epistles, prophecy. It's okay to take longer than a year to get through it all, but well worth it. When you finish, start over as there is always something new to learn. Use a real book with real pages from time to time as well and highlight verses that speak to you personally.