Do Your Research.
There is no way to totally avoid scams. However, you can do your best by checking with the Better Business Bureau to see if there are any complaints posted, doing Google searches of reviews, and by reading the info contained on the company’s website.
When looking at employment opportunities, remember that no company is perfect. There will always be someone out there who has had a negative experience. The people who have had negative experiences are usually the ones the ones who write reviews.
With regard to sales jobs and business opportunities, a lot of work and consistency are involved. You will not become successful overnight.
You may also encounter people who will try to steer you towards other companies. Follow your gut and do your research.