Baby food

Someone help I’m trying to figure out the baby food thing. I have a little while to go til my son starts eating foods other than breast milk but I’m a big planner and I just want to understand it.

So I know it’s normally suggested to start foods around 4-6 months when the doctor recommends it and I’ve seen the charts of what foods to introduce when. I am wondering how I will incorporate that with him eating his breast milk. He will still eat breast milk and then also start eating purée baby food right? How often does he need food and how often would he get breast milk? I just don’t understand him having both and when breast milk/formula stop completely

I’m just confused and very curious lol. Someone help please