clarify use of odata with swagger

[figuerres]

i am looking at the sample project but there is a lot of stuff there i am not sure if i need to have to get my code to work.
can someone please document what the minimal set of files and packages are that are needed to get a fully working api with swagger ?
i have entity data models for my sql tables.
i just want to have the normal OData like i used to have with asp.net 4

get/ post/patch/delete methods for each entity.

i see stuff in the sample that i am not sure if its all needed or some options or what ?

what is the ODataOpenApiController for ?

ODataOperationImportController is that just for the sample ? and not needed in a real api set ?

do i need all the classes in the OpenAPi folder for using swagger ?

thanks!