update cheatsheet

modules/cheatsheets/Day-2.md

@@ -38,15 +38,18 @@ result.
 - **Getting help** - For any function, you can write `?FUNCTION_NAME`, or `help("FUNCTION_NAME")` to
 look at the help file for that function.
 - [**R Projects**](https://support.rstudio.com/hc/en-us/articles/200526207-Using-RStudio-Projects) set the working directory where the .Rproj file is.
-- [**R Markdown**](https://bookdown.org/yihui/rmarkdown-cookbook/working-directory.html) files look for file paths relative to where the `.Rmd` file is located
+- **Reading in data (manual)** - *Download the data*, *Put data in the project folder*. Go to File, Import Dataset, From Text (`readr`), browse for the file, and finally click "Update" and "Import".
 
 ### Functions
 |Library/Package|Piece of code|Example of usage|What it does|
 |---------------|-------------|----------------|-------------|
-| `readr`| [`read_csv()`](https://www.rdocumentation.org/packages/readr/versions/1.3.0/topics/read_delim)| `df <- read_csv("<url>")`| Reads in a TSV file from a specified file path. This function can be tailored to read in other common types of files. i.e. read_csv(), read_rds(), etc.|
-|`readxl`| [`read_excel()`](https://www.rdocumentation.org/packages/readxl/versions/1.3.1/topics/read_excel)| `read_excel("dataset.xlsx")`| Read in an excel file.|
+| `tidyverse` (`readr`)| [`read_csv()`](https://www.rdocumentation.org/packages/readr/versions/2.1.5/topics/read_csv)| `df <- read_csv("<url>")`| Reads in a CSV file from a specified file path.|
+| `tidyverse` (`readr`)| [`read_tsv()`](https://www.rdocumentation.org/packages/readr/versions/2.1.5/topics/read_tsv)| `df <- read_tsv("<url>")`| Reads in a TSV file from a specified file path.|
+| `tidyverse` (`readr`)| [`read_delim()`](https://www.rdocumentation.org/packages/readr/versions/2.1.5/topics/read_delim)| `df <- read_delim("<url>", delim = ":")`| Reads in a delimited file from a specified file path.|
+| Base `R`| [`head()` / `tail()`](https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/head)| `head(df)` / `tail(df)` | Returns the first or last part of a dataset (or other object).|
 | Base `R`| [`getwd()`](https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/getwd)| `getwd()`| Finds the current working directory.|
 | Base `R`| [`setwd()`](https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/getwd)| `setwd("Desktop")`| Changes the current working directory.|
-
+| Base `R`| [`View()`](https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/View)| `View(df)`| View a spreadsheet-style data viewer on a matrix-like R object.|
+| Base `R`| [`str()`](https://www.rdocumentation.org/packages/base/versions/3.6.2/topics/str)| `str(df)`| Display the internal structure of an R object (dimensions, class, etc).|
 
 \* This format was adapted from the [cheatsheet format from AlexsLemonade](https://github.com/AlexsLemonade/training-modules/tree/master/module-cheatsheets).