Why not "revenir" in the place of "rentrer"?

Is the "à la maison" really necessary?

I thought that venir + infinitive translated as 'to have just ....... and didn't realize that it was necessary to add 'juste' as well.

I'm a little confused with this sentence. Why is it past, and why is it back home rather than from home?

can I use "soi" in place of "lui"

I entered exactly the sentence above and it was marked wrong, with "tout" added to the correct answer. Why??

What about: mon père avait rentré? Is this possible as well?

can someone explain why "has come back" is not the past compound tense and why eon must use "vient" as well as "revenir" or "rentrer". I don't understand the grammatical construction of this translation at all in particular why "juste" is not necessary in one of DUOLINGO's alternative translations