Bodywork Questions, also dumb mistakes

furyus2 said

The only way to fill holes is to weld them. The fender on the car has a lot of bondo in it. The one off the car has issues, but it looks to be a better bet. If you invest in a good welder, you will never regret it. Some body tools from Harbor freight should help.

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What about the fender on the car points to lots of bondo? Just trying to get a better eye for this kinda stuff. Also, if the fender off the car is in better shape, would it be beneficial to fix it before bolting it on, or bolt it on and then continue on to bodywork?