shit coins and scam projects can be identified by going through the project website, whitepaper and possible exchanges the project will be listed and how the roadmap is scheduled. Investing in alt coins might lead to investing in shit coins and scam projects. Its safer when we invest in bitcoin because there are lots of new projects coming up and they mostly turn into shit projects or scam.
You checking a project's website, whitepaper and possible exhange those not mean you won't still fall in scam coin, sometimes the scammers always make sure everything is really, it will be difficult for you to know that they are scammer, their whitepaper, roadmap and website is always perfect but at they end they still endup scamming their investors, so the only coin I will advise everyone to invest in is just bitcoin.