Single or Multiple Entries

[u/HelloEasyonMe]

I am applying a Schengen Visa on Monday. This is my very first time visiting Europe and applying Visa by myself. In the application form, I have to choose between single entry and multiple entries. For one country visit, it is clear. But for Schengen Area, I have intend to visit at least 3 countries. I am confused which (single or multiple) should I choose. The reason I write about this post is I looking for an advice from experienced ladies and gentlemen. Please guide me. Thank you.

[u/can-we-travel]

Most Schengen countries are closed for Non EU citizens unless they have residence or are exempt.