Do I get my earnest money back if the deal falls through?
Usually yes if you cancel within a contingency (such as inspection, appraisal or financing) and follow the contract's deadlines and notice rules. If you back out for a reason the contract does not allow, the seller may keep it. ListingCraft for Buyers's closing checklist shows each contingency deadline so you do not miss one.
Read the exact deadlines in your signed contract, and send any cancellation in writing before they pass.