My advice is to play with your food. When you're cooking pasta, pull a piece out every few minutes and test it. When you're cooking something in a pan or pot, stir it. Observe how it changes the longer it cooks at different temperatures.
Now, I've been yelled at by cooks before for playing with my food too much. There can be consequences. Opening an oven every 10 minutes lets all the heat out and can impact baking, making stuff collapse. Stirring the shit out of something, while it can prevent it from burning or sticking, introduces a lot of air into the product. For whip cream or a cream sauce, that's fine. For oil based sauces, that's kind of a nono.
That said, you can't know about the effects of making things hot until you experiment. Since you're not cooking for a job (where I learned), you have to mess with your food a lot to learn the rules of heat, flavors and moving food around the pan.
Bottomline though, to me, a terrible cook is someone who starts food and then walks away from it. While that doesn't necessarily apply to stuff like baking...if you're sauteing, grilling or making a sauce, you stand by that food and you pay it the attention it deserves. Short of a microwave or baking, there is no such thing as fire and forget cooking.