Yes.Examples:
Bible, Scriptures, Word of God, Gospels, Old Testament, God, Almighty, etc.
no
The way you capitalize other words. If it's at the beginning of a sentence it should be capitalized. If it's not then it shouldn't be capitalized.
No.
In most quotations you should capitalize the first word and the other words necessary; as in any other regular sentence. There is no need to capitalize most words just because they are in quotations.
Words like a, an, and, or.. You should always capitalize "the" in any part of the title such as, The Dog That Killed The Unicorn. Or something.
When you are writing formally you should, but you dont have to.
weeping willow
In a title, you should capitalize all words except for short conjunctions like "for," "and," "but," and "or" unless they are the first or last word in the title.
No. It's not necessary. It should be --- Hey there.
Because its a name and you capitilize every ones name.
Yes, you should capitalize "Northern Hemisphere" as it is a proper noun referring to a specific geographic region.
In the salutation "Good day to you," you only need to capitalize the first word, "Good."