Help me with my new website!

[T0 Th3 M4X]

Do you think it would be a good idea to apply to the Hostinger hosting for 8$/month and 10x as much bandwidth? I can keep the same URLs, and, right now, 8$/month doesn't sound too much (I pay more than that for my mobile phone right now). Though every dollar is good if I somehow end up homeless, and I can't really know what will happen to me (I don't know enough programming to make money with that, and I could have never guessed both my parents would have become unemployed and that my mother would have ended up in jail for an entire year).

I pay big money for an Azure VM now, but I played around with shared hosting for several year.  They are pretty much all crap.  For you, I would imagine that region might be an issue is well-- ideally you'd like something hosted in your part of the world.

If possible, I recommend finding a small company in your country that does shared hosting.  I did that in Korea, and it still wasn't great, but it was 1000x better than hostgator or any of those super-big sites.  googling "shared hosting in croatia" gave enough results for you to try I think.

Is the same true for other web-hosting services who claim high uptime?

Absolutely.  I dealt with hostgator, A2, and a couple others.  I even paid for higher tiers of more elite service.  They were total crap.

And what would be the advantages of building it in PHP? I can see an obvious disadvantage right now, I can debug JavaScript using the Safari Developer Tools, but I don't know how to debug PHP.

Server-side builds have the following advantages, among others
-can access a private database easily
-save processing power of users
-hide more of the logic behind your site so that people can't reverse-engineer your efforts

So for example with your assembler, all the client can see is the final result; they won't be able to read (or just easily copy) your algorithms.

That being said, I know a lot of systems are going more client-side these days-- lots of async AJAX calls to load parts of pages, and so on.  I'm not criticizing, I was just curious why you did it that way.

He can just use a CDN if he wants it faster, but the pages he's creating don't require high resources and the traffic won't be heavy enough to matter.