Things to Look Out for Buying Second Hand Cameras

I’m just starting at learning videography, and would like to buy a second-hand DSLR to practice with, if possible with one or two lenses, with a budget of 15,000 NTD. To those with experience in the field, what are the things someone should look out and be careful for when shopping for a second hand camera, and are there any places particularly recommended to buy second hand cameras? I am considering looking for a Canon 60D, but if anyone has some better models for starters who want to use the camera for a long time, please drop a recommendation. Thank you very much.