The difference between Galaxy S, J, A, Note and others

Hello.

Before choosing a smartphone, you need to ask yourself, "What am I going to use it for?"
If it's just for making calls, sending messages, emails, and browsing the internet, you need a "basic" smartphone.
If it's for watching movies or series during a trip, you'll need a large screen.
If it's to run fairly demanding games, you'll need a high-performance phone.

Personally, I don't have a very good opinion of Samsung. I think they play a bit too much at being "Apple," releasing phones that aren't necessarily getting better but are getting more and more expensive.
Today, I find that Wiko or One Plus make phones that are at least as good in quality but much cheaper! (I'm a Nokia user on Windows Phone, so my opinion isn’t influenced by what I use). Having had the One Plus One in hand, it's an incredible Android smartphone, with great performance, for under €300 with 64GB of memory (for me, the phone of the year 2015).
So, in my personal opinion, I advise you to look at options other than Samsung, and if you really want a Samsung, think about what you want to use it for, and you can choose the phone based on that.

Best regards.

I found this article (at the end of the article) that clearly explains the difference between the Galaxy S, J, A, etc.

https://www.frandroid.com/marques/samsung/264679_une-nouvelle-gamme-de-smartphones-chez-samsung-les-galaxy-j

The OnePlus One is a great discovery for me, thank you once again.