How professionals sand a drywall wall

That’s how to to sand a drywall perfectly.

For doing this job perfectly is necessary to use a Drywall Sander machine:

Below you will find a top with The Best Drywall Sanders:
Best Overall: WEN DW5084 Dual-Head Drywall Sander.
Best Budget: Gator 6549 Sanding Disc.
Best Manual: Hyde 09165 Drywall Vacuum Hand Sander.
Best for Professionals: Festool Drywall Sander.
Best Handheld: WEN DW1085 Handheld Drywall Sander.