I have read some of the articles in the links, and some of them give incorrect advice, such as:
Using paid password manager: It is true that it has features such as encryption and others, but you still depend on a third party, and once it is hacked, all your money and accounts can be accessed, use opensource self-hosted one.
Sites like ---> Haveibeenpwned.com: Although they are good, they may record your data, so it is better to try to reduce sending emails, use the aliases emails feature
[1], and check the link before clicking on it.
Remembering the password: Whatever the method, remembering the password is a bad option. The best thing is to generate the password with seeds and save it on a piece of paper if you do not want to save the password digitally.
Finally, the security of your device is the security of your use. For example, if you used a strong password, copied it, browsed to an unknown site and it asked you for clipboard permissions, then a long password will not help you.
also, using an air gapped phone to manage 2FA apps and password manager will be useful.
[1]
https://proton.me/support/addresses-and-aliases#:~:text=You%20can%20get%20a%20%2Balias,alias%20in%20your%20user%20settings.