What is the difference between total revenue and operating revenue?

Operating revenue is revenue generated from prime activity of business, or the typical activity that is reoccurring in nature.

on the other hand

Non Operating revenue is the revenue from source that is not related to the typical activity of business. It may include gain from investment (if organization is not itself a financial institution) , gain from property or by selling some asset or gain from currency exchange.

Total Revenue is the sum of both Operating revenue and non operating revenue.

For example:

Abc Co manufacture furniture, the revenue from selling furniture is $50000

and it also sell its one of its property at $45000 that ABS Co bought several years ago for $40000. ..

operating revenue---------= $50000

non operating revenue(45000-40000)= $ 5000

total revenue (50000+5000) $ 55000