All attachments, no matter their form, are part of the Illusion=Ego=Programming=Mind.
They distract you from what is really important: Your Mission,Raising Vibrations, Reaching Higher Levels of Consciousness and inevitably going back Home, IN Full Consciousness=Love Everywhere Present. That implies Choosing LOVE Every Moment, and Ego can't go there, cause Ego is everything that's not Love. So,once you start shedding the Ego, Letting Go of Attachments is a big part of it.
Ego can be very tricky, so first of all, You have to be aware of what attachments are. You can have an attachment to people,things,habits. Observe yourself. Where do you mostly place your Focus/Energy on ? What are you serving ?! LOVE or Illusion ?!
If you identify an attachment to a thing, or a habit it's easier to Let Go. You just do, sort your priorities and stay Focused.
What Humanity may find more challenging is Releasing Attachment to a Person. The 3D World - in which we all have been living for a while LOL- has been based on Dysfunctional Relationships. In Reality We are All Connected. We are All Brothers and Sisters and We All have the same parents- MotherFatherGod-. We are ONE.