This quote means that you can feel more free and happy when you don't let things affect you personally. "There is a huge amount of freedom that comes to you when you take nothing personally" is like saying that when you don't get upset or hurt by what others say or do, you feel lighter.
Imagine you have a backpack. "There is a huge amount of freedom that comes to you when you take nothing personally" is like taking out heavy rocks from your backpack. It's easier to walk and move around without the heavy weight of taking things personally.
In simple words, this quote tells us that not getting upset over what others do or say can make you feel much better. It's like not carrying around heavy bags of negative feelings, which lets you enjoy life more and feel more free. Just like taking out the heavy rocks from your backpack, not taking things personally can make your journey through life easier and more enjoyable.