Excel Basics

Do not mix data types, only have words and letters or only numbers in each cell.
_____ vs. _____ translates to y-axis vs. x-axis
Have all data for one axis all in one column with no spaces
Data for x-axis on the left and data for y-axis on the right
Insert trendline with 'more' menu using the dark arrow at the top of the right-click menu and include the best fit equation.
It is possible to switch the axes if data is switch when graph gets generated.