you should have a list of specific urls and website that you are gonna move from Google or type manually, no one should visit websites other than specific ones.
I do not know anybody who browses the internet in that way. And even if you do, that does nothing to protect you against your final destination being compromised or the many possible attacks which do not require you to connect to a specific website first.
For instance, I have created bitcoin wallet in 2021, on a laptop that was connected to the internet. I have some $$$$ into it. Till today, nothing suspicious has happened and I am in total control of my funds, at least no one has stolen them from me.
I also have a number of hot wallets on a number of different phones over many years, and have had nothing happen to them. I continue to use such wallets as my daily spending wallets. But I am under no illusion that although I have been safe thus far, these wallets have the worst security of any wallet I use, and therefore I only ever store an amount I am willing to lose in these wallets. They are for convenience, not safety. Given that OP is talking about buying bitcoin and holding it for "a very long time", a simple hot wallet like this would be a very poor choice.