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1 BTC starts to be a respectable amount for many. I’d consider acquiring a hardware wallet such as Ledger Nano S / X, or a Trezor for storage. In my case, that was the first thing I went for after reading quite a bit about different types of wallets. If you do, make sure you buy it at an official site.
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Ledger:
https://www.ledger.comTrezor:
https://trezor.ioCheck that they ship to your country and/or the list of resellers. I prefer the main corporate site as a first option.
You can buy or sell with ease. The selling process is mostly done through an Exchange (not always), and will require you to move the BTCs you wish to sell from the hardware wallet to your wallet on the Exchange (when the time comes). There will be a TX fee involved, but it’s pecata minuta next to the safety of having it on a hardware wallet. When you purchase, again normaly at an Exchange, the process is the same but in the other direction (you will move from the Exchange wallet to your hardware wallet). If you are going to trade frequently, you need to device your strategy and perhaps leave some on the Exchange itself (small amounts for day to day trading (*)). If you want to store and perhaps sell at some future point in time, move it all to the hardware wallet.
Read through the hardware wallet’s sites to get to see how they are managed. It’s pretty easy, but you need to be sure of how to perform certain things such as store your (normally) 24 word mnemonic, set a pin, etc.
(*) Normally, it is not recommended to leave funds on an Exchange, since you do not really control the private keys associated to your funds there.