In order to optimize my chances of avoiding scenario 1, I think I need a new smartphone or laptop. Which will be used strictly for management of crypto.
Is a laptop better than a smartphone? Does it need to have specific characteristics?
Am I missing some things?
The suggestions above regarding having an airgapped device are good suggestions
if you are planning to store your bitcoin on a wallet on that device. It sounds like you are not planning to do that, since you have bought a Ledger hardware wallet.
Given that your bitcoin will be safely stored on your Ledger, then having an airgapped computer doesn't really add anything to this set up. Correct me if I'm wrong, but it sounds like you will be using this computer to actually buy the bitcoin and send it to your hardware wallet? In that case, that computer cannot be airgapped - obviously it will need an internet connection in order to interact with an exchange or another person in order to purchase the bitcoin.
I don't see how there is an other option to buy BTC. For this purchase we are all exposed to the internet.
The laptop I am using at this point (MacBook) is about 7 years old. I am going to need a new one anyway. So in that regard I can buy a new one.
However it will be necessary for postgraduation courses and it will be exposed to the internet. That is not safe.
Also, about 6 months ago I was the victim of online credit card fraud on my current laptop. I had made 1 payment with a visa card online. A hacker has gotten to my card details and made a payment with my visa card in a foreign country. Insurance paid it back to me.
So this laptop is not safe and I don't know if any other laptop is safe when my email address linked to the exchange is the same one.
I have installed malwarebytes but it did not find any breaches when I ran it.
Buying a new Macbook just for managing 1 BTC is very expensive. And I would need a second one for work anyway.
So I considered buying 1 new laptop for work, and 1 new smartphone just for purchasing BTC. I'm not planning on trading a lot.
Please let me know if this scenario is unsafe:
I buy a new smartphone (for example Samsung) just to purchase BTC. Most likely in incremental amounts to test it.
When I get to 1 BTC on the exchange, I transfer it to my ledger device via my smartphone which should not be exposed to malware as it is new.
I leave my BTC on the ledger and keep it hidden, along with the seedphrase. I'm planning on never typing the seed phrase on any laptop or smartphone so a key logger can't get a hold of it. I'm not planning to connect the ledger to the internet a lot. But at some point I will have to, right? For example to check the balance.
Or to convert it back to currency when I want to.
If BTC ever gets to a large value (above 10x) I can purchase an air gapped device to leave it on.
I have never used Linux and I am an internet safety noob. It is one of the main reasons why I have not invested in BTC earlier. I was worried that a hacker would eventually get a hold of my details.
If that's the case then yes, it is good idea to have a clean computer which you only use for bitcoin and not for daily browsing or anything else, since this will minimize the risk of downloading malware. Personally, I would use a laptop, format it, and install a Linux distro of your choice on it rather than a closed source spyware OS like Windows. If you've never used Linux before, then a distro like Linux Mint is a good place to start.
I am hoping that I can do these things with an affordable smartphone as well. But I have never used Linux and it makes me uncomfortable. 1 mistake and I am done