Baby on schedule?

Haidee • 30 yrs old- female
I'm so confused How do some of the moms here have their baby on a schedule? If you do have your baby on a schedule why did you do it and how you got started?
My little one is 3weeks, I feed her every 3-4hrs and put her to sleep about an hour after feeding or sometimes she falls alsleep immediately after. I just go with her flow. Babies are unpredictable that i just dont get it. It feels like I only take naps since she was born but I expected it to be like that. Looking for some insight.