Today's studying English.

Today, I learned English about 'Do you...? (present simple questions)'
Here are sentences what I made. Please check'em and fix that! :)

Do I know you?

Do I do what I wanna do for real? (Remember that "wanna" is very informal, usually just spoken, for "want to")

Do you work at (or for) Google?

Do they like her?

Does she have some fun? (This is a weird sentence to me. I don't think I'd ever say it in the present tense like that, and the "some" sounds off, too. You may say, "is she having fun?" Or "did she have fun?")

What does she make her smile? (This dodsnt make sense, but I'm not sure what you're trying to say)

Do you cook Korean food?

Do your friends work with you?

Does it snow a lot there?

What does this word spell?

Does he always look at people with stiff face? ("Stiff face" doesn't really work in English... Not sure what you want to say. But it should be "a stiff face" anyway. I think normally when you have a singular noun, you need an article. 

What do you usually do when you have a day off?

I always thank you guys for your help!
새해 복 많이 받으세요!

Hi, 
I've corrected some of the sentences in red. 

For the blue highligted sentences, can you type them in Korean. 무슨 말인지 모르겠어요. 

Today's studying English.

Today, I learned English about 'Do you...? (present simple questions)'
Here are sentences what I made. Please check'em and fix that! :)

Do I know you?

Do I do what i wanna do for real?

Do you work in at Google?

Do they like her?

Does she have some fun?  (I think you wanted to say, "Did she have fun?") 

What does she make her smile? -> What makes her smile?

Do you cook Korean food?

Do your friends work with you?

Does it snow a lot there?

What does this word spell? -> How do you spell this word (or How do you spell the word xxx)

Does he always look at people with stiff face?

What do you usually do when you're on your days off?

I always thank you guys for your help!
새해 복 많이 받으세요!