They want to know that they are getting a great home at a great price, especially in this market.
Deliver this, and it's a win-win!
From your MLS research you'll do, you can determine what a "great price" is for most any home (so long as you know exactly what you're looking for in your due-diligence period). From your comments in your question, it appears you do...
So, the "great home" is your first and primary focus.
This is where (You) ask the questions so you may determine what home will best fit their needs. Just as well, you'll need to know what resale features play a role in market values, per prospective home and it's neighborhood "averages".
Depending on your area, price range, etc. this could be anything from the difference in one bathrooms and two, two garages or three, 1/4 acre Lot or greater (or less), open kitchens, vaulted ceilings, one story, two, or multi-level, mostly updated or commonly outdated, pier and beam or slab, awkward Lot shape, corner Lot, road noise, high traffic/semi high traffic, school proximatey, walk-score, convenient access or burried in a neighborhood, the values of each floor in a skyrise and it's direction/view value, which direction the home faces per the afternoon sun ~V.S.~ the morning sun...
and the list goes on and on.
Once you get going with your license, you should come by my office some time and I'll show you how Keller Williams helps their Agents with all of this. Whether you've chosen a Brokerage or not, it's never a bad time to take a better step in the right direction for yourself. It's always free to explore your options, and trust me, your buyers will definitely want to explore their options when making such a big financial committment. And, so should you.
Feel free to ping me on this link when you are ready to explore.