I have observed that R installation in Windows creates two library paths automatically.
.libPaths()
# [1] "C:/Users/User/Documents/R/win-library/3.4"
# [2] "C:/Program Files/R/R-3.4.0/library"
What is the use of these while installing new packages and which library is used? I have frequently observed the installed packages being missed and need to install again. How do you maintain these two paths and manage the libraries while using R or RStudio in Windows?