publish apps on apple store

I also don't know what to copyright. do i have to do something to get a copyright? or you just need to put your name and surname.

it asks me for a series of info including a url that I don't have

Please be more specific. What info, exactly? What URL?

I wonder if only companies can publish them.

No, you can publish apps as an individual.

do i have to do something to get a copyright?

Strictly no, you automatically own the copyright in work that you create and don't have to do anything explicitly to claim it. Having said that, in practice it is a good idea to put "(C) My Name 2022" somewhere. Most importantly, if you are using someone else's material under licence, and if the licence requires that you include an attribution, then you must include that attribution somewhere.

Copyright (and related subjects) are complex; I'm sure you could find some good introductory material aimed at software developers online somewhere. Maybe a university's undergraduate "intro to intellectual property" lectures? Most good Computer Science courses will include this these days.

You can create a link to a privacy policy that you will need to create, and host it on google sites.

thank you for your availability. by url I mean the one asking apple for privacy and assistance. so i have to create a site? for the privacy speech, do I have to write something important? the app does not request data from those who download and use it. So I have to create a website with this info? what should i indicate for privacy? for the material I downloaded some pngs that I use in the app, it says that it can be used for apps or something else, should I indicate this?

so i have to create a site?

Yes. (It could be extremely basic.)

what should i indicate for privacy?

I don't know, what actually is your privacy policy? Will you be collecting all of your users' financial information and selling that to criminals, for example? If that is your plan then you need to disclose that in your privacy policy. If you don't collect any information then your privacy policy could be extremely short.

 I downloaded some pngs that I use in the app, it says that it can be used for apps or something else, should I indicate this?

That depends on what they require. For example, Creative Commons have a variety of licences, some of which require attribution and some don't.