Do you want sugar in your coffee? Do you want sugar in your coffee?
We can use the verb 'do' alone: I do my e-learning.
Or as an auxiliary with a main verb to form questions and negatives:
Do you do your elearning at weekends?
I don't do my elearning at weekends.
The auxiliary verb does not have a specific meaning but is necessary to form these structures.
He doesn't feel well.
Does this train go to London?
Do you like steak? Yes, I don't like pork.