exclude na - please help from someone just starting

Is this what you want to do?

library(tidyverse)

# Sample data
brfss2013 <- data.frame(
     genhlth = as.factor(c("Fair","Good","Good",
                           "Very good","Good","Very good")),
         sex = as.factor(c("Female","Female",
                           "Female","Female","Male","Female"))
)

brfss2013 %>%
    drop_na() %>% 
    count(genhlth, sex) %>%
    ggplot(mapping = aes(x = genhlth, y = n)) +
    geom_col(aes(fill = sex), position = "dodge")

Created on 2020-03-13 by the reprex package (v0.3.0.9001)

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