Ron Swanson is an incredibly smart man. (And if you don't know who he is, you should probably go watch all of Parks and Rec and then come back here. Seriously. Go watch it.) Anyway.
This quote can be applied to a whole ~butt load~ of things, but I'm a fitness person so we're gonna relate this to fitness.
Folks decided that they want to get healthy/fit/lose weight and suddenly they have 29 balls in the air and they don't know how to juggle them all.
Mostly exercise. "How many times a week should I exercise? Should I do cardio first or weights? Do I have to do cardio? How do I do a deadlift? What about planks - how do those work? Does sex count as cardio? (Yes.) And also food. "Okay so I track my calories but I went over, what now? Can I eat sugar? How much protein is too much protein? What actually IS protein? Can I still have ice cream?" Has this happened to you?
Learning a bunch of new stuff at once can be a bit overwhelming and confusing.
I have my clients pick which one they want to focus on first: their workouts or their nutrition. For a few weeks, that's what we work on. I teach them the how tos, how to make it a habit, all the basics. Once that foundation is super solid and they feel like that have a good understanding, we move on to the other.