For the start download and install no other third party wallet, but use the official Litecoin core wallet (Windows, macOS, Linux). As an alternative to the core wallet you could also consider starting with the lightweight Electrum wallet. The Litecoin core wallet needs to sync with the Litecoin network, it downloads the whole blockchain which takes a couple of hours after initial start.
Third party wallets might not offer the same security and your first few Litecoins might be stuck, if you don't even meet minimum withdrawal amounts, so use the official one first.
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