Some of the ways I have come across and or used are:

1. Create a domain with multiple email accounts, one ID per provider (e.g. les@mydomain.tld, let@mydomain.tld.etc)
2. Using alias with existing email address like gmail, zoho, domain, etc. (e.g. name+les@gmail.com) Also See the comment from @Groentjuh below.
3. Use an email relay or forwarding service like ImprovMX or Altmail (or others, pick your favourite)
4. Using a temporary or disposable email (pick your favourite)
5. Using anti spam software (which one?? )
6. Use a Faux email address (I call this the Duh! method - basically two accounts with same or different providers, one email is the 'front face' other is the real email that you use. Set up forward from the front face to the real email account)

As of this morning IST,
I finished the draft of a post this morning on a related topic, in which I list the above 6 options. The post ran to over 3,700 words, so will not bother you with a link right now. Maybe the finished version.

Then I saw this post by @Groentjuh int he offer thread
https://talk.lowendspirit.com/discussion/comment/55594/#Comment_55594

example+novos@gmail.com will just go to example@gmail.com. It's a simple way to allow you to use "unique" emails for each sign-up. In case of gmail, it also ignores any dots. So e.x.a.m.p.l.e@gmail.com will also go to example@gmail.com. Alternative options are having an catch-all email account on their own domains or creating aliases for each service.

Since the two are quite related, I decided to post this discussion, with the below questions:

1. Are there any other methods that you use?
2. Which is your preferred system for masquerading or protecting real email(s) ?
3. Which of the above 6 methods in your opinion are suitable for beginners intermediate/advanced?

Thanks !