That may have been quite a lot to take in, but if you have made it all the way to the end, congratulations! The hard part is now over, and you are familiar with the modern versions of OpenGL, the programmable pipeline and general-purpose rendering. Even SFML itself was built around basic principles like the ones we have gone over, some of which we have already covered extensively.
In the next chapter, we are going to be covering the basics of lighting to create a more dynamic feel to our world. See you there!