Many people in the Netherlands also speak English and German, so any knowledge of these languages will increase your chances of finding work. You are not required to do so, but it would still be wise for you to learn Dutch; it will not only grow your chances of finding work, but also help you successfully create a place for you in society and integrate with the people around you socially. It will allow you to make contact with your neighbours more easily, be accepted in local sports clubs more quickly, and communicate better during a doctor’s appointment.
You can learn Dutch by studying the language yourself, by taking a course, or by finding a language studying buddy. Many municipalities offer a language buddy service, which will match you to someone to meet up with every week and chat with, read with, or have a cup of coffee with, whatever you prefer. This allows you to practice having conversations in Dutch and will teach you a lot about Dutch culture. Being a part of Dutch society starts with learning the language!
If you are planning to come to the Netherlands and are able to find a Dutch language course in your home country, do go ahead and start on learning the language as soon as possible!