I'm looking to paint some unpainted old drywall in a garage.  From what I gather, you need to apply mud to the joints then immediately apply the tape and mud over them again (then sand when dry).  How many more coats are absolutely necessary?  I watched a video where they applied 3 coats.  I'm not looking for perfection but also don't want weak and cracking joints.
  
Also, I assumed that you just prime and paint the drywall. However, upon further reading, I discovered that there is actually a drywall specific primer.  Is this what everyone uses for drywall.....is it necessary vs regular primer?__._,_.___
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