What information to indicate in the online store?

Question

Law in IT

What information must be indicated in the online store?
Here, for example, the conditions / return procedure - is it at the discretion of the store or is there any clear form? Or information about the legal entity? Or information about canceling an order?
And this phrase - that the site has an informative character, and is not a public offer - is it needed?
I looked through the shops - each in its own way. How will be correct ? Tell me who is in the subject please

Answer 1

Mandatory: Privacy policy (about the protection of personal data), offer / agreement with users, delivery, warranty and return of goods. These are all separate pages.
Postcode address.
Phone (it is highly desirable at least one with a city number + additional number).
Email.
The presence of instant messengers (Vatsap, Viber, Skype, Telegram) is highly desirable.
Vkontakte, Facebook, Twitter, Instagram, Youtube channel.
Road map.
Contact form.
Call order.
Chat.
All these things are considered commercial ranking factors, so they can affect the position of the site, especially in Yandex.