It's about as basic as is gets but attachment style in our upbringing has a major part to play in our later life, in how we relate to others and deal with life.
There are lots of videos and basically you will see lots around how this thing called your attachment style effects relationships. It makes sense but knowing is the first step to change and ultimately looking to be based around a secure base for your life.
Some videos to explain
A little deeper
Learning what your default style is