Can anybody please explain me what "change adresses" are?

I'm pretty new to the enviroment and I have been holding some BTC through a paper wallet that I created by running electrum offline, copying the seed phrase with some adresses (I avoid reusing adresses for privacy reasons), and then deleting it before connecting to the internet again.

However I have recently seen a text on Binance Academy about paper wallet and something about "change adresses" that left me quite worried and confused. It says as it follows:

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Another danger of using paper wallets comes from the misconception that funds can be sent multiple times from the same address. For example, imagine that Alice has 10 BTC on a paper wallet, and she wants to send 3 BTC to Bob while keeping the remaining 7 BTC. If Alice sends 3 BTC to Bob from her paper wallet, the remaining 7 BTC will be, by default, transferred to another address (known as the change address). This means that her paper wallet won’t have any balance left and she won’t be able to access those 7 BTC, as they were transferred to a change address that is not in her possession.

Alice could manually set the outputs of her transaction to include both Bob’s address and another address that she controls (to send the change back to her) - but this would require some technical knowledge. If Alice fails to create a change output for herself, the remaining 7 BTC could be taken by the miner that validates that transaction’s block. Therefore, she would be better off sending the entire balance (10 BTC) to a cryptocurrency wallet software, such as Trust Wallet, and only then send 3 BTC to Bob.

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Can anybody, please, explain me what does it mean? If I ever want to send a transaction, shouldn't I just import my seed phrase on electrum again and just send it? How would I loose all my funds? Does it mean that my private keys should change after every transaction I do? Sorry for my confusion.