I will give a sentence as an example:
本が深く教えてなかった。
The first question: Could things like book or door or etc... become subject of a transitive verb ?
The second question: Could a transitive verb work without an object ?
I will give a sentence as an example:
本が深く教えてなかった。
The first question: Could things like book or door or etc... become subject of a transitive verb ?
The second question: Could a transitive verb work without an object ?
本が深く教えてなかった sounds unnatural and hardly makes sense to me. In casual conversations, we usually say, for example, 本を読んでもよく分からなかった instead, with "I" as the implicit subject.
Your first question is covered in this question: In Japanese, can we say an object asks a question?
As for your second question, yes it's sometimes possible to omit an object. For example, you don't have to repeat the same object again in a conversation like this:
A: その本を読みましたか。 Did you read the book?
B: いいえ、まだです。 No, not yet.
A: では、読んでください。 Then please read it.
However many transitive verbs would make little sense if they completely lack the object. You don't usually say "I say" without specifying what you say. It's better to use an intransitive verb which have a similar meaning (e.g., there is a word "to chat" which does not require an object)
T.Verb + を + Direct Obj.
ドアを開けました。
I opened the door.
These questions are not about Japanese language. They are more about grammar in general.
-Could things like book or door or etc... become subject of a transitive verb ?
Yes. You can say for example:
台風は街を破壊した。The typhoon destroyed the city.
-Could a transitive verb work without an object ?
No. By definition a transitive verb requires an object. But you can omit the object from a sentence if it can be inferred from the context.