What kind of plot is this, and how can I learn to make similar plotting

I am interested in how this was done. Can this be done with ggplot? (I am interested in this kind of graph sorry. I should have been more clear)

library(ggplot2)
DF <- data.frame(Date = seq.Date(from = as.Date("2020-01-01"), 
                                 to = as.Date("2020-05-01"), by = 1),
                 Value = seq(1:122) + rnorm(122))
Projection = data.frame(Date = as.Date(c("2020-05-01", "2020-09-01")),
                        Value = c(DF[122, 2], 155))
rect_df <- data.frame(xmin=as.Date(c("2020-05-01")),
                      xmax=as.Date(c("2020-09-01")))

ggplot(mapping = aes(x = Date, y = Value)) + 
  geom_line(data = DF) +
  geom_point(data = Projection) +
  geom_line(data = Projection, linetype = 2) +
  geom_rect(data=rect_df,  aes(xmin=xmin, xmax=xmax, ymin=-Inf, ymax=Inf), 
            inherit.aes = FALSE, fill = "grey50", alpha = 0.5) +
  scale_x_date(breaks = seq.Date(from = as.Date("2020-01-01"), 
                                 to = as.Date("2020-09-01"), by = "month"))

Created on 2020-04-26 by the reprex package (v0.3.0)

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What about that second line? the one shaded