One thing that can be helpful is to do all the preparation before you start cooking. This is known as mise in place. (See https://en.wikipedia.org/wiki/Mise_en_place.) This can not only include the initial ingredients, but things that can be produced ahead of time and kept warm.
In some cases, you have plenty of time. If you're breading something to be fried such as chicken fried steak, you get your best results if it rests for half an hour after breading before you put it in hot oil. There is plenty of time there to do the rest of your preparation during that time.
Sometimes you cannot finish all at once anyway. For example, when making a gravy in the pan you used to cooked the entree. (If not making a gravy in the pan you used to cook the entree, why didn't you do it before you started the entree?)
And sometimes you don't want to finish them all at once. For a simple example, if I'm making a hamburger, I always toast the bun. If you toast the bun too soon, it can get dry. Since you need to rest the hamburger anyway for a few minutes (unless you like soggy hamburgers), I take the hamburger out of the pan and put it on a cloth or paper towel to rest and only then do I start toasting the bun.
One simple multi-tasking thing you can do while cooking is to wash the dishes as you finish them instead of allowing them to pile up. My first step when cooking nearly anything is to wash whatever dishes there might be in the sink. For example, if I had a piece of pie earlier, I don't bother to wash just one item -- I put the plate in the sink. The next time I cook anything, I start by washing the plate.
While cooking, as I finish with something, I wash it. It doesn't matter if it is a knife or fork or spatula or frying pan, ..., it gets washed then. When I'm ready to eat, there are no dishes that left to be cleaned at that moment. Everything is already washed that doesn't have food in or on it.
Naturally, this is much easier if you already prepped everything before you did any cooking.
When I finish eating, the only dirty dishes are those that I ate out of. If I ate quickly, the dishwater is still warm and I can wash it then, but I usually rinse it off and leave it in the sink to wash at the beginning of my next meal.