I agree Sami. Newbies often get tasty bait when they first join. Sometimes the upvoter is motivated to encourage the newbie but other times it's just to get them involved with one of their projects (which will ultimately make the project owner rich). Always best to keep a sceptical eye on the situation.
You've given some great advice there. I also would add that it's important to write good, original , quality content, focusing on what they know. We all have different life experiences. It's great to share and enrich others with this.
Thank you for your post.
Cheers
Anj :D