(1) XY scatter plot
This is most common and informative graph in scientific world as it can compare two variable.
In scatter plot many times we want to add prediction lines with associate model. We can add more than one Y variable so that we can make comparison in trend.
(B) Bar (Row or Column Plots)
Bar plots are useful when categorical variable is plotted with a numerical variable. Even if we want to plot numerical with numerical variable - one must be treated as categorical so that the bars are spaced as equal distance (not based on difference between them).