Coinmarketcap and coingecko are enough to solve scam problems if you are a newbie, you don't have to ask anyone for link to official website, contract address or telegram channel coinmarketcap and coingecko got you covered, no more fake contract address and buying fake tokens on uniswap, we have the right tools but many don't know how to use them.
Actually, it is not enough.
not all new coins are listed on Coin market Cap and also CoinGecko. if you are willing to invest in coins that have been in the CMC and CoinGecko, it seems easier. but we must also be careful because not all data show that the coins are not shit. I mean that not all coins listed on CMC or CoinGecko are worthy to invest, many of them are also heading to shitcoins. But yeah, at least if we have been checking that the coins are listed on those two sites, we can really get the essential information including what you are talking about.
But for the new projects in which they are not listed yet on those two sites, we must do some analyze deeper.
We can analyze from the team, telegram group, smart contract, and many more information. too good to be true projects may be also suspicious.
Btw, related to the fake smart contract or fake coins, yes exact if they re not listed on CMC or CG, we must ask it to the official admin in the official group. This is to make sure the probabilities.