The Calvin cycle is the companion to the light-dependent reactions in photosynthesis.
The chemical reactions that make up the Calvin cycle are often called "the light-independent reactions" because they don't involve light and chlorophyll. But this title is a little bit misleading, because the Calvin cycle can't really function without the products of the light-dependent reactions, namely ATP and NADP.
Here's the video which can hopefully make this all more simple:
I left out an important enzyme when I made this video. At the very beginning, when a 6th carbon atom is added to the RuBP, the process takes place with the help of a protein called rubisco. Rubisco is the most abundant protein in green plants, and it might be the most abundant protein in the world. Sorry, Rubi. I'll remember you for next time.
Anyway, I make these videos public to help people out, but the real science learning comes from open dialogue with other people who are also studying biology, science, or whatever. That's why I encourage you to ask questions.
In fact, I really hope you'll consider joining the Science Learning Forum. You can get all the information about it by clicking here.
As an online biology tutor, I always try to make things as simple as possible. Photosynthesis is a challenge. It took me a while to understand photosynthesis, and I'm still working on splitting it into bite-size pieces. In fact, this isn't my first photosynthesis video, and it won't be the last one, either.
There has been some discussion about photosynthesis on the science learning forum. So if you have any biology questions, about photosynthesis or anything else, post your questions either here or on the forum.