To make your writing clear, concise, and legible.
How can you make any sense without plurals and possessives? You have to use the words you need to make yourself understood.
I need three sentences using plural and possessives on how to store personal financil effusively and efficiency
No, because plurals do not need an apostrophe.
You will need a English Degree for writing travel magazines. You need to have proper writing, editing and grammar before you can have anything published in the magazine.
No. Most style guides suggest that the apostrophe is not needed to indicate the plural.Other than these erstwhile exceptions, the apostrophe is an indicator of possession, not plurals. Unless there is a need to avoid confusion, you can write the plural of 7 as 7s.
3 (oxen, horses and geese)
Respondents do not necessarily need to be capitalized unless it is a proper noun or the beginning of a sentence. It is a matter of style and preference in writing.
Usually not. This is awkward and confusing to the reader, instead say "didn't need". But, if you are writing a poem or any other elegant piece of writing it might be acceptable. Though you should abstain from using "needed not" in everyday conversation.
Yes, it is a proper name. However, you do not need to add Desert as Sahara means desert. When you write Sahara Desert you are writing Desert Desert.
An "s" forms the plural of most English nouns, e.g. bird, birds. When nouns end in "o" or "s", they form the plural with "es" (potatoes, mosses). The "apostophe s" is used to indicate possessives, e.g. Bill's job, the boss's wife. Plural possessives also use the apostrophe, but omit the "s", e.g. his brothers' company.
To do what you describe you need the proper hardware and software. A touch screen with character recognition software will do the trick.
I don't know that it would open any doors such as connections for your novel but you would learn a lot. By taking these classes you would learn the proper way of writing and it would make writing your novel so much easier for you.