How to implement mapping data from an external database to Bitrix24?

Question

Bitrix24

Good afternoon!
How to implement a connection to an external database from Bitrix24 to receive and display the received data in the site section?

Answer 1

How to implement a connection to an external database from Bitrix24 to receive and display the received data in the site section?

This is too broad and abstract a question that cannot be answered unambiguously.
For example, you write about Bitrix24, but it comes in two editions: a cloud version and a boxed one.
If you write about the cloud - write your application and output as you want. Everything that the API allows is available to you.
If you are talking about a box, then your question can be classified in many ways: from the logical "how do I want to see data from an external database" to the technical "how can I connect to the database in php". In any case, the official documentation of the developer on the platform will help you (site management and Bitrix24 have a common platform).
Perhaps if you elaborate on your question or break it into several parts, the answer will be more precise useful.
PS If you give an analogy, then your question sounds "How to conquer Everest?", which you will agree is too abstract. If you break it down into several questions (for example, "What equipment is needed to conquer the mountain", "How is the climb up the mountain", etc.), then the answer will be more accurate.