Handling NA in R | is.na, na.omit & na.rm Functions for Missing Values

How to handle NA in R programming - 4 examples for is.na, na.omit & na.rm.
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The R code of this tutorial:
Load data
data("airquality")
Find missing values
is.na(airquality)
Count missing values
sum(is.na(airquality))
Omit missing values
na.omit(airquality)
Remove missing values
mean(airquality$Ozone, na.rm = TRUE)