Define and Explain:
Grammar, Punctuation, and Conventions By: Blake Brown
Grammar
Grammar is the wording that you use while speaking or writing. Proper grammar is something that is necessary for writing and formal speech, but is sometimes ignored in less formal environments. Good grammar is having the correct word choice for different scenarios, and not messing up the phrasing of a sentence. Poor grammar would be something like saying "Me and my friend went to the store," because the correct grammar would be "My friend and I" went to the store.
Punctuation
Punctuation, like grammar, is also very important in writing. Good punctuation includes correct use of periods, commas, colons, semicolons, quotation marks, exclamation marks, question marks, and a few more. There are a lot of rules on when to use what punctuation, and different scenarios to use different types of punctuation. Periods are used to end sentences, commas are used in lists, or before conjunctions, you need quotation marks around quotes, exclamation marks are used instead of a period when the sentence is exciting, or the person saying it is excited, question marks are used instead of periods in questions. These are the most common forms of punctuation. Without proper punctuation it's hard to tell the pace of what the author is saying, and to tell the emotion or meaning behind the words.
Conventions
Conventions are all of these sort of mixed together. It includes grammar and punctuation. It also includes correct spelling, and word usage. Proper conventions are necessary to seem professional and convey your message in the most efficient way possible.