Travelling abroad helps us to come across many lifestyles.
...good start :)
Learning about others' lifestyles helps us to have a better understanding of the place and thereby, which helps to make a better relationship with the people.
learning about others' lifestyles help you learn more about those people like their culture, cuisine, beliefs, traditions etc. So I feel you should replace the word "place" with "them"
This essay focuses on the ways how other cultures and traditions are learnt and the reasons for some people's specific interest in learning other customs.
This is slightly deviating from what your prompts asks. Your prompt talks about;
When visiting foreign countries, visitors should take full advantage of learning the culture and traditions of that country. How can they learn about the cultures and traditions? Why do some visitors strive to learn about culture and traditions, while others are not interested at all?
So... you need to answer why some travelers love to learn culture and traditions while others are not interested in them. Also you need to discuss that how those who love to learn about cultures can learn.