Asking questions without "do" in them [duplicate]

In school, we learned that in interrogative statements to use do (e.g. Do you want to go there?).

I'm wondering if there are any cases when do is not required.

For example, I'm thinking if this is this correct: Want to learn to code? I may help you.—meaning that if the asked person wants to learn programming, it could be possible that I'm available to teach her/him programming.

So, what is the difference between Want to learn to code?/Want to code? and Do you want to code?

Also, how can this be this question changed to have the same meaning, to be correct but still friendly and informal (e.g. it should be something that can be posted on Twitter)?

Solution 1:

No real difference between Do you want to learn to code? and Want to code? They're saying the same thing; in the second example, the Do you is implied.

It's like saying Nice day instead of It's a nice day. It's the same thing really—just a matter of formality versus informality.

As far as making it a friendlier interrogative, one of the comments suggests Would you like to learn to code? That's a great fix and works well. So does something like Looking to learn how to code? or Interested in coding?