Dropbox teams personal folders

For both of your questions, to list the contents of any particular folder or namespace, whether or not it is shared, you should use the /2/files/list_folder and /2/files/list_folder/continue endpoints. You can start by passing in the empty string "" as the "path" parameter value to list the contents of the root for the call. You can also use those with the "member file access" feature, if your app is connected to a team with the relevant permissions.

In addition to the pieces of documentation linked there, I suggest reading the File Access, Team Files, and Detecting Changes guides as well, as those may be helpful in your case.