I am not overly interested in rope work but it certainly has a place in bondage. Rope can especially be useful as one starts experimenting with bondage since it can be fairly inexpensive and easy to store. If you are interested in knowing more about knots and have an iPhone check out Knots 3D. I was able to download the app free about a week ago but you may find it worth purchasing.
Disclosure: I was not compensated for this post in anyway. Additionally, I will not be compensated in anyway if you chose to purchase the app. Finally, I have no affiliation with the makers of the app. This is simply a recommendation of an app that you may find beneficial.