This is a great website for learning about the graphs of rational functions. Shows you everything from the horizontal and vertical asymptote to the intercepts. It sketches it all out for you which makes it ten times easier.
Tells and shows graphs of what logarithmic functions look like. Also, gives you a graph and lets you plug points in and see what the graph looks like. Great way to find out how to use log functions.
This website tells you about exponential functions, and also has a interactive program that allows you to see a graph and change the points on the coordinate plane which changes the graph. This is very helpful in knowing how the graph works.