From your suggestion, I understand that I need to use an Electrum wallet to store my Bitcoin. Aren't wallet and exchange two different things? I can use an exchange to trade Bitcoin. And a wallet is just for storing Bitcoin. Am I correct?
Your correct the two are different but a little bit interchangeable, just simply treat exchanges as a market place where you buy stuffs and wallet as your home where your stuffs are securely stored in. Exchanges can also be used to actually store your bitcoin but it’s the worst place to do that.
Actually,Exchanges are also a type of wallet, the difference is just that they are custodian¢ralised in most cases , making them much more easier to offer their users more service fetuses than a normal self -custody wallet..
So to the OP, if you are willing to hold then consider using a self-custody wallet( with storage as an extra layer). Whenever you need to buy, sell or exchange (in short trade) then you can use exchange services to do that easily. After you are done and have some BTC you want to hold you can move it to your self custody wallet.it’s that simple.