Hi Vivin,

Going to try and keep this short since there is a good answer on here already. 

In short, as a fulfiller or end user it's not going to impact you at all. It's a new UI, some things are in different places from where you're used to clicking but other than that I really don't view it as a big deal.

If you're an admin on the other hand or building scoped apps as delegated developer, there will be some things to be aware of in the articles Mark linked. There are a few things that do raise the blood-pressure in Next Experience as a developer, but I would say overall there haven't been any show-stoppers.

There is a new training course on NowLearning called 'Welcome to ServiceNow' which covers the Next Experience quite well, I would suggest that as a resource for getting users up to speed with the new UI.