diff --git a/.DS_Store b/.DS_Store
deleted file mode 100644
index 5008ddf..0000000
Binary files a/.DS_Store and /dev/null differ
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9ce4559
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,67 @@
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# History files
+.Rhistory
+.Rapp.history
+
+# Session Data files
+.RData
+
+# User-specific files
+.Ruserdata
+
+# Example code in package build process
+*-Ex.R
+
+# Output files from R CMD build
+/*.tar.gz
+
+# Output files from R CMD check
+/*.Rcheck/
+
+# RStudio files
+.Rproj.user/
+
+# produced vignettes
+vignettes/*.html
+vignettes/*.pdf
+
+# OAuth2 token, see https://github.com/hadley/httr/releases/tag/v0.3
+.httr-oauth
+
+# knitr and R markdown default cache directories
+*_cache/
+/cache/
+
+# Temporary files created by R markdown
+*.utf8.md
+*.knit.md
+
+# R Environment Variables
+.Renviron
diff --git a/unit_05/.DS_Store b/unit_05/.DS_Store
deleted file mode 100644
index 342556d..0000000
Binary files a/unit_05/.DS_Store and /dev/null differ
diff --git a/unit_08/.DS_Store b/unit_08/.DS_Store
deleted file mode 100644
index f9b47ae..0000000
Binary files a/unit_08/.DS_Store and /dev/null differ
diff --git a/unit_08/regression_fit_2d_exercise/.Rhistory b/unit_08/regression_fit_2d_exercise/.Rhistory
deleted file mode 100644
index 2d4062d..0000000
--- a/unit_08/regression_fit_2d_exercise/.Rhistory
+++ /dev/null
@@ -1 +0,0 @@
-library(shiny); runApp('regression_fit_2d_exercise.R')
diff --git "a/unit_08/regression_fit_2d_exercise/Icon\r" "b/unit_08/regression_fit_2d_exercise/Icon\r"
deleted file mode 100644
index e69de29..0000000
diff --git a/unit_08/regression_fit_3d_exercise/.DS_Store b/unit_08/regression_fit_3d_exercise/.DS_Store
deleted file mode 100644
index 5008ddf..0000000
Binary files a/unit_08/regression_fit_3d_exercise/.DS_Store and /dev/null differ
diff --git "a/unit_08/regression_fit_3d_exercise/Icon\r" "b/unit_08/regression_fit_3d_exercise/Icon\r"
deleted file mode 100644
index e69de29..0000000