so how do we know that crypto exchngers dont sell us the coins what they dont exisit?
and how do we know those big funds who bought or pretinding to buy or sell some big ammounts of cryptocurrency `?
how do we know they dont lie us ?
To verify that you need to search the exchanger in coinmarket cap. The fake exchanges always have a low capitalization or they aren't even listed on the site. So, that's the right way to know if you can trust on the exchange, and it's important to search for some information about the exchange on this forum, that way if someone get's scammed then they will report it here and give a warning to other users.
And about the coins that don't exist, that's a weird question, you can't buy something that doesn't exist but you can buy something that doesn't have value for other users. So, my advice is; if you want to invest in altcoins then go for the popular ones and avoid tokens and shitcoins.
It's better to take a few surveys before trading your coins. I frequently use coinmarketcap to check whether the coins are genuine or counterfeit.
A large portion of the trading stage is a scam, so you must be cautious.
Maintain a strategic distance from those coins whom you're not very much aware these are the shits coins.
Attempt to pull back your coins to your own wallet accounts, on the off chance that it gives you an error; at that point, it will be a scam or fake one.