Here is another useful grammar tip about something that I see people mess up all the time, especially in Roleplays.

When it comes to quotation marks and punctuation, people often make mistakes.

First rule:

-Periods and Commas ALWAYS go inside quotations, even if it's a single quote.

I.e.

He said, "Hand me the basket."

She said "He said 'Hand me the basket.'"

Second rule:

Question marks' usage is based on common sense, for example, if you wished to denote that somebody asked you something, you would say it like this:

He asked me, "Has anybody seen my keys?"

If you're asking somebody about a quote that is anything but a question, it would be done like this:

Did he just say "That snake is biting my face"?

An important thing to remember is that if you're using a question mark like in the above example, you don't use a period or comma inside the quotation marks.

If you're asking somebody about a question, use only one question mark, and put it in questions, like this:

Did he just say "Why is this snake eating my face?"

@Harmonic Revelations

Yes!!! People always make those mistakes as well. Nice tips

I didn't know the first two ones.

I was not aware of #2. Thanks for this

I'm swedish and I feel awesome for knowing all of these :3

(though I always do wrong with the who/whom thing xD)