# Types
class(2)       # numeric
class('hello') # character
class(FALSE)   # logical
class(NA)      # logical

# Variables
varname <- 'value'

# Vectors (arrays)
vector <- c(1, 2, 3)

# Conditions
if (TRUE) {
  # ...
} else {
  # ...
}

print(TRUE & FALSE) # And
print(TRUE | FALSE) # Or
print(!TRUE)        # Not

# Import packages
install.package('package-name')
library(package-name)