I recommend that you use the BestChange service to choose an online cryptocurrency exchanger. BestChange has collected information from more than 440 exchangers
Every exchanger present on BestChange website has been thoroughly checked before listing, and BestChange team constantly monitors due performance of exchangers. Here you can find an exchanger for buy litecoin in a short time https://www.bestchange.com/visa-mastercard-usd-to-litecoin.html and other cryptocurrencies
First of all, you need to consider how promising the cryptocurrency is. I mainly buy promising altcoins. Because they can give a good profit. I buy cryptocurrency on Binance. As for me, is Binance safe https://tradersunion.com/interesting-articles/is-binance-safe-key-facts-you-should-know/, you can see for yourself. Now, by the way, the bear market, so you can profitably buy cryptocurrency.