Spend more time in the Word. Identify a good 'through the Bible' teacher and stay with the program once, twice, three times.... Topical studies are okay once you have a good foundation of the whole Word. Then, when you have difficulty understanding meditate on it and ask the Lord for help. This has always worked for me.
After a while you will begin to recognize a teaching that either sounds strange or diffierent, or in some instances downright wrong. Go back to the Bible and check it out. Don't wait for someone/anyone (other than the Lord Himself) to tell you if it's right or not. We learn truth by immersing ourselves in the Word of God, then when counterfeit teachings come to our attention we can recognise them.
Ph 3:15 (paraphrased):...And if on some point you and I think differently, that too God will make clear to us. Only let us live up to what we have already attained.