I write this for all of you that visiting this post, not just for newbie or beginner.
Lets just straight to the point, you need at least 3 different email addresses.
Or you could go full nutcase like somebody...
(whom I always see when I look in the mirror)
I nearly have one email account with a different password for each important service.
Furthermore, that is only from my standard chrome browser as I also have two portable versions that I keep around for thigs I deem more dangerous or which are heavily customized for plugins and blocks.

Wallets do not need emails, so the platforms and financial services must be connected to secure emails and then use an offline phone to ensure that the e-mail is not compromised/hacked.
Creating a lot of e-mails requires the inclusion of a phone number which greatly weakens security.
Why would in the first situation a phone be secure but not in the second?
If you use a throwaway sim (which in my country you must load with at least 1 euro to not lose the number) it's as safe as it can get.
Sim swap is not possible against prepaid phone cards.