It seems like with the older Bond films, they were more standalone "adventures" and could each be enjoyed without seeing the others. With the new movies, they definitely aren't as easy for me to follow since they are clearly more connected.
I basically started to lose it somewhere mid-Quantum. Of course I've read plot summaries of each, but the ones I've seen try to explain only what is going on in that particular movie. I've seen through Spectre, but I could easily tell I was missing a ton of main plot points.
So, my main question: How are the events throughout the Daniel Craig Bond films related as we go from Casino Royale through Spectre? I'm not looking for plot summaries of each movie, but a more overall explanation of what's actually going on, and how it connects each film to the next.