Electrum wallet is recommended, it is non-custodial and open source, but it is a hot wallet or cold storage depending on how you use it, if you need a wallet for storing a small amount of BTC, you can use electrum as a hot wallet, but if you need a wallet to store a large amount of BTC and for the long run, maybe you should learn how to set up an electrum wallet as a cold storage (1 or 2), or buy a hardware wallet.
I hope you know that your funds are not only safe because of the wallet you use, but also by how you use it, if you expose your seed phrase or keys your funds would be stolen, so as you learn more about wallets, also learn how to use them in a safe enviroment.