"I have an R Studio project. I've imported my Excel file named 'online$\_$sales$\_$csv$\text{'}$ into R Studio."

my file has many datasets: order$\_$id$,$ Date, customer$\_$id$,$ product$\_$id$,$ product$\_$category, quantity, unit$\_$price, total$\_$price, and customer$\_$location.

I am required to recommend and apply two pre$-$processing methods. These methods can involve transforming data conversion from one type to another. $($Provide code$)$

Suggest $2$ attributes that can be transformed for a better data analytics process.

Note: Provide a rationale for each proposed and executed technique with results evaluation.