Hi Anthony,
I recommend you follow all the advice relating to casing that is out there - if you can do a case for MBB, you can do a case for Dalberg. This entire site and many others are dedicated to this very question - i recommend you buy case books, search Q&A, pratice with other PrepLoungers to answer your massively broad first question.
In regards to Dalberg, as you're learning how to nail cases, make sure you focus on cases relating to what Dalberg actually does, key words including:
You should be VERY familiar with the challenges posed by the African and S American economic, political, and social landscape when it comes to completely ANY case type. I have a few cases I could give you if you're interested.
Hello!
Not personally, but in the Q&A there are insights of other people who asked this in the past and got insightful answers.
Good luck!
Hi Anthony,
I helped a few candidates interviewing with Dalberg and have a good number of questions they asked, please feel free to PM me if you have specific questions.
Best,
Francesco