Can you suggest some precautions for beginners to avoid getting scammed ?
I think you must never invest your funds on hyip and Ponzi website, it will be scam service in the ending, the investors never get back their money, if you want makes transaction on here always use escrow service that can be trusted with the sign many positive reviews from another users, i hope it will help you to avoid from scamers.
I agree with you . Investing in HYIP and PONZI is a big mistake. We can lose all the money we have. But there are some jobs that are also high risk, for example is gambling. So I think a beginner should be able to avoid everything that has a high risk. with a small capital you can become discouraged and left bitcoin forever.