During this period we have been heard often in the “R” language associated with power bi. I suggest to who is interested to use it these Cheat Sheets:

R Cheat Sheet: simple pdf with the principal function and script that you can use on R

Data Table Cheat Sheet: a series of suggestion to understand ad use data in the table format on R

GGPLot2 Cheat Sheet: a pdf only on ggplot2 library, the most used library to create chart visualizations.

Moreover i suggest two another link about data science:

Data Science base: an article about what we need, hardware and software, to start to become a data scientist

Data Science Advance: a list of 20 tutorial about data science, R, big data and manchine learning