1. Ensure you protect your Bitcoin very well, protecting your Bitcoin simplily means cross- checking wallet before sending funds to the wrong wallet address.
You probably meant address checking, not wallet checking, right?
2. Don't share your seed phrase with anyone because it's your personal phrase .
And if I am ready to share seed-phrase, for example, with my heirs, then what should I do?
3. Ensure you store backup phrases offline not online to avoid someone copying it.
Offline, if someone discovers seed-phrase, no one will be able to copy it?
Offline mode also has its advantages and disadvantages. There's no perfect storage method.
4.Always recheck wallet address before sending funds to the wallet, because it's irreversible.
The first few characters and the last 3 digits?

5. Avoid links from unccessary agent using Whatsapp platforms or telegram to share, try to detect.
For any operations with cryptocurrencies, it is safer to use a separate PC\laptop or OS.
6. Your devices should always be updated regularly.
For example, hardware wallets? What if the update contains a critical bug?
It's best to wait a while after the update releases to allow the developers to fix any potential bugs.
7. Try to detect lesser transactions before sending larger amounts
Can also split a large amount into several transactions and send them sequentially at intervals.