The only one you can be sure will look out for your interests is you. Be cautious of accepting advice from people you don't know, especially free or unsolicited advice. If they found you, rather than vice versa, be suspicious. The anonymity afforded by the Web provides an incentive for those of questionable character to try to pull the virtual wool over your eyes. Don't believe everything you see online.
People often disguise their motives.
Sales pitches are often disguised as 'educational resources'. And even if the opinions and advice are well-intentioned, they may not be accurate or worthwhile. All information and advice you receive is not of equal reliability or utility. Be especially suspicious of recommendations for penny stocks. Make a mental note of the recommendation and later check how they did.