Yes, it is very true that travelling increases your knowledge. Whenever you travel you know different people, you explore the place you come to know about there culture so it is very important that you should travel. Even when you travel to a place you are quite interested in the history behind it so in a way your brain is getting new content and which is actually a good thing.
The best thing in life is not to have degrees but to gain more experience. When you travel you actually gain a lot of experience which is beneficial for you. You develop into a better person which ultimately leads to the development of your personality. So leaving beside everything, travelling helps you to become a better person.