That is so easy to answer. Being knowledgeable will be the main factor to avoid those scammer. Scammers tend to victimize all ignorance when it comes to this field.
If you are knowledgeable about cryptocurrency and bitcoin you can really avoid all the scammers, and then do not trust anyone especially the people who have negative background. In addition to that, do not share your password and private to anybody so that you can avoid all scammers on online.