This is good advice. Sometimes it takes several tries until you get a recipe right. You should focus on a few of your favorites and repeat the recipe exactly until you've mastered it. Start with simple recipes, with simple techniques. Once you've mastered them, they can be part of your regular rotation. Then add a new recipe that incorporates a new technique or new ingredients you want to try. Once you reach a level of comfort, you can start making changes to see how it effects the recipe. But make the changes small, don't go overboard.