What would be a good project car I can buy to learn how to fix cars?

I really liked cars all my life. I did buy a brand new mazda that i have as my reliable daily driver. But i really want to learn how to fix cars myself and would like to buy an older project car. Probably under $5k. What would be a good place to start?

What would be a good project car I can buy to learn how to fix cars?
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