What the heck is this triangle trying to tell me!?
Aperture and bokeh are synonymous now a days. You will often find yourself trying to get as blurry of a background as possible when starting out, or maybe you're shooting a group of people so you want to make sure every one is in focus. Pro tip if you have two or more people in the frame it is always best to shoot at f/5.6 or higher. I found that f/8 is typically my sweet spot for this. Anyway in the example below I new that I wanted to isolate the red flower as the subject so I decided a shallow depth of field was my best choice. I set my aperture as low as it could go; f/4. because of this I knew I was letting in a lot of light so I compensated with a fast shutter speed at 1/1000 and the lowest ISO option on my camera at 100.
As I mentioned above, it is as a last ditch effort that I raise my ISO. Being that high ISO bring in noise I typically leave it at 100 which is the lowest that my camera can go. However, I found myself on a set of this local show, Inside Monrovia, and the lighting wasn't ideal for photos. To make up for the lack of light I set my aperture at f/4, ,which is the lowest I could go. I brought my shutter speed down to 1/100. This was as slow as I could take it, being that any slower would introduce too much motion blur. Even with both settings like that I still didn't have sufficient light so I found myself bumping up my ISO to 6400. Thanks to lightroom and photoshop I was able to keep the noise down to a minimum, but that cost me some sharpness in the end result. So be careful with ISO! You will have to bump it up at times but make sure you have you aperture and shutter speed set as low as possible so that you don't have to raise your ISO as high.
I apologize if you're feeling a little overwhelmed. This is why photographers laugh when people say that all we do is point and shoot. We have to know how to read a situation, decide how you want to expose(seeing how much bokeh you want or if you want to freeze motion or implement motion blur.), dial in the settings, compose the image, decide on posing, assure the pose and facial expressions are on point and so on and so forth. If you're an event photographer or wedding photographer then you typically have to do all of this in seconds and quickly adapt to new situations as the day unfolds. There are still other factors to consider as well, you may want to implement off camera flash so that is an entire new setting to learn and balance with the exposure triangle. Or you may find yourself using an ND filter which is also a new setting to learn and balance. Anyway, that's not to scare anyone away from photography. I guarantee you that it only sounds like a lot when you first start out, but as your progress you will learn to do this instinctively and will only get quicker and better at it. The key is to understand how to use your camera and practice practice practice!