Ignoring the commas

If you don’t read a recipe closely it could ruin your dish. For example, if a recipe says “1 cup walnuts, chopped” this means measuring one cup of whole walnuts and then chopping them. “One cup of chopped walnuts” means that you would chop the walnuts before measuring.
Read how one home-baker mastered baking bread from scratch after years of failure.
Checking on your food while it’s in the oven

It’s very tempting to open the oven to check on your food and get a whiff of what’s to come, but it could cause your food to be undercooked. Every time you open the oven door it releases enough heat to change the temperature. If you want to be able to see your food, turn on the light and look through the oven window.
Using cold ingredients

It’s very important to use room temperature ingredients when baking (unless the recipe calls for otherwise). Warmer ingredients are not only easier to mix together, but it will also make the end result fluffier.