The word "awesome" is a casual way of saying "great" or "wonderful". Actually, the meaning of the word has changed a bit over time. So 20 years ago, you would have used "awesome" to describe something that was really amazing, but today people often use it to describe things that are just good.
It's used mostly by people in their mid-20's to mid-30's but can also be used by younger or older people without seeming strange.
When you describe a person as being "awesome", it means that the person has a good personality and is fun to be around.