When getting cryptocurrency wallets, you have to download blockchains, my question is what is it used for?
Is it okay to put your coins in the wallet before the [Suspicious link removed]pleted?
It's probably seems like a stupid question but I'm completely new on this market.
You posted on wrong part of forum.
Blockchain is used to store all past transactions that happened from 2009. That is needed not only as a place to look what was transacted in past but also to check if bitcoin in your wallet are legit. Since they were crated and then transacted in past. Without blockchain, your wallet and any other wallet where you plan to send coins, would not know if you are sending them real or made up coins.
And yes you can send coins into wallet before clockhain is synchronized. But is not so wise specially if you are doing it for the first time. Because you should try to send tiny amounts first to learn and prevent losing something valuable, since Bitcoin transactions cannot be reversed.