Butter at room temperature retains 90% of it's flavor; refrigerated (cold) butter loses 90% of it's flavor. ALWAYS let butter reach room temperature before using!
I keep one stick of butter at room temperature because if it is soft it doesn't take as much for a roll or a piece of bread. We were eating entirely to much of it and since I started doing thiis the butter lasts a lot longer and we still are able to slather it onto whatever we are eating.
In the U.S. a stick of butter is typically equal to 1/4 lb = 8 Tablespoons = 4 ounces = 1/2 cup = 113 grams.
Butter can be expensive but it can also be difficult to use up bulk shopping before it goes bad. Here are some tips for long term storage.
In many recipes, you can substitute butter for shortening. Here is some advice if you are wanting to try this substitution. This is a page about using butter instead of shortening.
Many people believe that butter is a very unhealthy food and choose margarine instead. In truth there are some documented reasons that butter, in moderation, can be good for you.