Questions on SPO

Hi Community, 

One of our customer raised the below query:

Difference about SharePoint and SharePoint in teams;

How it works?

How to organize and use Teams to organize departments, if it`s possible to manage access and on which kind of levels (for files as well that are shared in the Teams);

Access Management

When do you use SharePoint and when to use Teams to access different types of files/documents?

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More Calrification:

We have a client that have stored business documents in SharePoint in a well-organized system. The client wants to keep that system as a master-library and just link to a folder or file from different team.

Eg the folder “Sales” (that is stored in SharePoint under the folder “Organization”>”FOLDERS”>”Sales report”)
The client want to link to the folder from both team “TEAM1” – channel “REPORT” and team “TEAM2” – channel “SALES”, so that both teams can look at the files.
Changes is done in the master and appears in real-time in the linked up folders.

Any pointers would be of great help!!