Doubt with removal of the blocks

Hello.

I would like to raise a question that, until recently, I thought I knew, but recent events make doubt me about it.

It is a doubt that Oracle made with blocks that have been removed from a table.

I understood that if I empty a table using the "truncated" command, the table blocks are released. This means that the space that becomes available is returned to the operating system?

In other words, it will be the size of the reduced storage space?

The other question if I delete records in a table using "remove them", make these deleted blocks available to store new data either from the same table or another?

When it would be convenient to use the command 'shrink '?

I know this may seem very basic questions, but I would appreciate any clarification.

Concerning

You do not remove blocks, you delete records.

Deleting records NEVER returns the free space to storage or operating system. The space will be available at the same table only.

Truncate a table returns a space to the storage space, but not the operating system.

Narrowing of the datafile (s) could return data back to the OS.

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