Survivor EXP is EXP that is used to upgrade survivors. There are several types of survivor exp, such as Survivor exp (development) and Survivor exp (combat).
How can I obtain development EXP and combat EXP ?
You can obtain development EXP by assigning Development Survivors to buildings in your Town that correspond with their occupation, daily task, event, etc.
You can obtain combat EXP by defeating walkers on the map, daily task, event, etc