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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Jul. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of property and equipment stated at cost less accumulated depreciation
   As of July 31, 
   2021   2020 
Furniture, fixtures and equipment  $187,053   $141,065 
Vehicles   574,606    575,831 
Total   761,659    716,896 
Less: accumulated depreciation   (189,632)   (110,656)
Property and equipment, net  $572,027   $606,240