Is Scraping dangerous? Should use VPS for that?

How to know what to scrape?
Brother, there is no guaranteed recipe. Look for what others are doing, look for datasets that buyers are most interested in, etc. That really depends on you doing the research.
 
Yes, it can, but it's a very low chance like 0.01%. If you overdo something or publish some secret information, it might get eyes on you. Otherwise, I can scrape all the stuff and nobody complains.
 
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