"Do you speak English, Mara?"
Translation:DIvI' Hol Dajatlh'a', mara?
So, was I wrong for putting "DIvI'Hol" with no space or "bIjatlh'a'" for "do you understand"?
Yes; both of those are errors.
DIvI' Hol should have a space, and "do you speak" should be Dajatlh'a' here since the verb has an object.
bIjatlh'a'? is "Do you speak?" when there is no object (the prefix bI- indicates that the subject is "you [one person]" and there is no object while Da- indicates that the subject is "you [one person]" and the object is one of "him, her, it, them" -- here, the singular noun "English").
And finally, "understand" is yaj, not jatlh.
But congratulations for getting the I versus l bit right!
You used lowercase L and both of them should be uppercase i. The Duolingo font makes it difficult to distinguish, but if you look carefully, you will see a small curl at the bottom of the l (L) that isn't on the I (i).
This is mentioned in the Tips & Notes. If you have not been reading the Tips & Notes, I would like to ask that you review those so we don’t have to continuously repeat the information that we have explained there. If you have read them and still have a question, please be specific in your question so we can figure out where the confusion is.
If you are doing the course on iOS or Android, you cannot currently access the Tips & Notes through the app. To access the Tips & Notes, you will have to access the course using a web browser at https://www.duolingo.com/, either from your mobile device or from a computer. When you click on a Skill, it will expand to reveal a Start button and a light bulb. If you click on the light bulb it will reveal the Tips & Notes and give you a detailed explanation of the grammar that is introduced in that Skill. If you have questions after reading the Tips & Notes for any Skills, then please return to the forum to ask your questions, explaining what you didn’t understand or what seems contradictory to you.