My personal tip, use a brand new email for every new website you need to create an account with, if they require an email address. You can easily make one even using gmail and any old android phone.
We cannot use separate email for every website we register. First it will be hassle to create hundreds of emails as every email require you to verify it with the phone number and managing them is not an easy task. I personally have 3 email ids and they are enough for me.
Privacy-focused email services like Protonmail and Tutanota exists, and if you pay for their service, you can have email aliases, so you wouldn't need to create separate emails for different websites. You just create a new alias then you're good to go.
Also, if you're just going to register on a website and you're going to use your account probably once(especially on shitty and shady websites), you can use burner emails through services like guerrillamail.com.