How to examine any currency to ensure before buying it.
First, through the Coin Market Cap site, you can search for any currency and then follow the numbered steps here..
1. The first image is an example of the currency $WIF that we want to examine its details to reassure ourselves before buying any currency.
2. Click on the About section
3. Click on SolScan or EtherScan
4. Click on the Holders section to know the distribution percentages of this currency across different wallets. If we find that one wallet holds most of the currency, this is the first negative sign.